Journal articles: 'Radon analysis'

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Wang, Xiao Qun. "Radon Anomaly Analysis of Engineering Slopes." Advanced Materials Research 261-263 (May 2011): 1161–66. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1161.

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For various engineering slopes, due to unloading relaxation of the rock mass or sliding disintegration of the slope, the cracks inside the slope will open by different extent, thus when measuring radon content, different parts of the slope will have different radon content anomaly. Through analyzing radon content anomaly, information as the landslide boundary and structure zoning of the slope rock mass, etc can be obtained. Landslide boundaries and rock mass structure zoning and other information can be identified because of radon anomalies analysis. Through radon anomalies analysis on two projects, landslide boundary identification and zoning on bank-slope adit rock mass structure, it has proved that radon anomalies analysis could be well used as a complementary method to provide more analysis data and thus provide objective scientific basis for slope stability study. The analysis method used is simple, easy to operate, and low in cost. In the analysis, it shall be noted that removing interference from groundwater, desiccant humidity should be excluded.

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Kadir, Abdumomin, Lei Zhang, Qiuju Guo, and Juncheng Liang. "Efficiency Analysis and Comparison of Different Radon Progeny Measurement Methods." Scientific World Journal 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/269168.

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Radon exposure to the public contributes more than half of all the radiation doses caused by natural radiation; accurate measurement of radon progeny is quite essential for the dose evaluation of radon exposure in environment. For the purpose of establishing a radon progeny standard and controlling measurement quality of commercial devices, it is quite important to analyze the efficiency of different measurement methods and determine which would be the most appropriate for radon progeny measurements. Through theoretical analysis and experimental measurement, some commonly used measurement methods were compared in this study and the development trends of those methods were reviewed. Results show that for radon progeny measurement, the spectroscopic analysis method is better than the gross count method, while least-square calculation methods is better than traditional three-count or five-count method. Multiperiod counting ofαplusβspectrum as well as using weighted least-square calculation method might be the best choice for accurate measurement on radon progeny in standard radon chamber when calibrating commercial radon progeny monitors.

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Jiang, Fu Liang, Zeng Guang Yang, Xiang Wu Qi, and Xiang Yang Li. "The Indoor Radon Concentration Measurement and Analysis in a University and its Adjacent Areas." Applied Mechanics and Materials 737 (March 2015): 512–15. http://dx.doi.org/10.4028/www.scientific.net/amm.737.512.

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Radon is a radioactive gas, high concentrations of radon in the environment can cause lung cancer, leukemia and other diseases. In this paper, indoor radon concentration in different places were measured and analyzed by using the RAD-7 radon monitor in a university and its adjacent areas. On-site measurements show that within 24 hours the indoor radon concentration versus time has certain regularity, different interior architectural decoration materials has a certain influence on the radon concentration, the radon concentrations in long confined spaces are significantly higher than those places frequently ventilated, floor height and ventilation conditions have a greater impact on the radon concentration. This research can provide a reference for future prevention and control of radon hazards.

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Neugebauer, Thomas, Hans Hingmann, Jonas Buermeyer, Volker Grimm, and Joachim Breckow. "Radon emission rate and analysis of its influencing parameters." Nukleonika 61, no. 3 (September 1, 2016): 337–42. http://dx.doi.org/10.1515/nuka-2016-0056.

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Abstract The geological and structural conditions define the radon situation inside a building. While the geological realities can be specified by the content of radium-226 and the ratio of radon-222 emitted from the ground the structural conditions are defined by the tightness of the building envelope. The radon concentration inside has an unsteady character, which is caused by meteorological conditions outside and the air change rate (ACH or ACR), which in turn is influenced by the residents’ behaviour such as venting and heating. For the assessment of the radon exposition, it is necessary to perform measurements for a long time. An approach to reduce this time by eliminating the inhabitants influence on the radon concentration is the radon emission rate, also known as radon entry rate. This variable is based on the measurement of the radon concentration and the parallel determination of the air change rate via a tracer gas method, the result expresses a released activity per time. Due to their noisy character, it is necessary to apply a smoothing algorithm to the input parameters. In addition to mean values, the use of window functions, known from digital signal processing, was analysed. For the verification of the whole calculation procedure, simulations and measurements under defined conditions were used. Furthermore, measurements in an uninhabited house showed proof of the capability of the assessment of the radon potential. First examinations of influencing parameters of the radon emission rate showed a possible dependence on the temperature difference inside and outside the building.

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R. Stanifer, Stacy, and Ellen J. Hahn. "Analysis of Radon Awareness and Disclosure Policy in Kentucky: Applying Kingdon’s Multiple Streams Framework." Policy, Politics, & Nursing Practice 21, no. 3 (May 11, 2020): 132–39. http://dx.doi.org/10.1177/1527154420923728.

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The purpose of this article is to analyze radon awareness and disclosure policy proposed during the 2018 Kentucky General Assembly using Kingdon’s Multiple Stream Framework. Radon gas is the second leading cause of lung cancer. Exposure to radon occurs largely in the home. The proportion of homeowners who have completed radon testing remains low, and home radon testing is voluntary in most states. The Environmental Law Institute recommends states enact policies to promote radon awareness and testing. The most common radon awareness policy mandates radon disclosure during a real estate transaction. A bill to mandate radon disclosure during a real estate transaction was proposed during the 2018 Kentucky General Assembly but was met with opposition and was not filed. As a policy alternative, an administrative regulation to amend the Form for Seller’s Disclosure of Conditions was proposed to the Kentucky Real Estate Commission. Administrative regulations set forth by government regulatory agencies are equally enforceable and may be a more politically feasible alternative to enacting public policy. Nurses are positioned to promote the health of patients and populations. Nurses advocating for radon control legislation and/or administrative regulations may push radon control policy higher on the governmental decision agenda leading to policy change to decrease the development of lung cancer.

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Gonzalez, Fulton B. "Radon transforms on Grassmann manifolds." Journal of Functional Analysis 71, no. 2 (April 1987): 339–62. http://dx.doi.org/10.1016/0022-1236(87)90008-5.

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Ma, Ziping, Baosheng Kang, Ke Lv, and Mingzhu Zhao. "Nonlinear Radon Transform Using Zernike Moment for Shape Analysis." Computational and Mathematical Methods in Medicine 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/208402.

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We extend the linear Radon transform to a nonlinear space and propose a method by applying the nonlinear Radon transform to Zernike moments to extract shape descriptors. These descriptors are obtained by computing Zernike moment on the radial and angular coordinates of the pattern image's nonlinear Radon matrix. Theoretical and experimental results validate the effectiveness and the robustness of the method. The experimental results show the performance of the proposed method in the case of nonlinear space equals or outperforms that in the case of linear Radon.

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Zhang, Wei, Dongsheng Zhang, Xufeng Wang, Mengtang Xu, and Hongzhi Wang. "Analysis of Mathematical Model for Migration Law of Radon in Underground Multilayer Strata." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/250852.

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This paper summarized the separation process of radon based on its geophysical-chemical properties. Taking into account the geological conditions of mining, the mathematical model of radon migration in underground multilayer strata (UMS) was established to investigate the distribution law of radon concentration in UMS. It was found that the distribution of radon concentration in UMS is affected by both the properties of the strata and the depth of cover and the radon concentration law varies at different depths even in the same layer stratum. At last, in order to validate the derivation result of the mathematical model of radon migration in UMS, the actual measured values (AMV) and the calculated values (CV) were compared further. As a result, the CV was found to be approximately equal to the AMV with deviation values (DV) less than 5%, which indicates that the derivation result of the mathematical model of radon migration in UMS is correct.

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Henschel (INVITED), D. B. "Analysis of Radon Mitigation Techniques Used in Existing US Houses." Radiation Protection Dosimetry 56, no. 1-4 (December 1, 1994): 21–27. http://dx.doi.org/10.1093/oxfordjournals.rpd.a082416.

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Abstract This paper reviews the full range of techniques that have been installed in existing US houses for the purpose of reducing indoor radon concentrations resulting from soil gas entry. The review addresses the performance, installation and operating costs, applicability, mechanisms, advantages, and disadvantages of each radon mitigation technique. Active soil depressurisation (ASD) techniques are the measures most widely used by mitigation contractors. ASD techniques consistently and reliably provide the highest radon reductions, at costs often competitive with the less effective alternatives. The large majority of existing US houses having elevated radon can be effectively treated using ASD. Various other techniques can be used in houses where ASD is difficult or impractical to apply, or where lesser radon reductions are acceptable. However, these other techniques are always less effective, less reliable, or less well demonstrated than ADS.

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LI, YONGMEI, WANYU TAN, KAIXUAN TAN, ZEHUA LIU, and YANSHI XIE. "FRACTAL AND CHAOS ANALYSIS FOR DYNAMICS OF RADON EXHALATION FROM URANIUM MILL TAILINGS." Fractals 24, no. 03 (August 30, 2016): 1650029. http://dx.doi.org/10.1142/s0218348x16500298.

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Tailings from mining and milling of uranium ores potentially are large volumes of low-level radioactive materials. A typical environmental problem associated with uranium tailings is radon exhalation, which can significantly pose risks to environment and human health. In order to reduce these risks, it is essential to study the dynamical nature and underlying mechanism of radon exhalation from uranium mill tailings. This motivates the conduction of this study, which is based on the fractal and chaotic methods (e.g. calculating the Hurst exponent, Lyapunov exponent and correlation dimension) and laboratory experiments of the radon exhalation rates. The experimental results show that the radon exhalation rate from uranium mill tailings is highly oscillated. In addition, the nonlinear analyses of the time series of radon exhalation rate demonstrate the following points: (1) the value of Hurst exponent much larger than 0.5 indicates non-random behavior of the radon time series; (2) the positive Lyapunov exponent and non-integer correlation dimension of the time series imply that the radon exhalation from uranium tailings is a chaotic dynamical process; (3) the required minimum number of variables should be five to describe the time evolution of radon exhalation. Therefore, it can be concluded that the internal factors, including heterogeneous distribution of radium, and randomness of radium decay, as well as the fractal characteristics of the tailings, can result in the chaotic evolution of radon exhalation from the tailings.

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Yarmoshenko, I. V., G. P. Malinovskiy, and A. V. Vasil’yev. "A meta-analysis of oncoepidemiological data on possible link between radon exposure and lung cancer." Occupational Health and Industrial Ecology, no. 2 (March 14, 2019): 92–96. http://dx.doi.org/10.31089/1026-9428-2019-2-92-96.

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Radon and its derivatives are a global natural factor of radiation infl uence on humans. New data on risk factors of lung cancer and signifi cant volume of epidemiologic and medical statistic data collected recently in various parts of the world prove that meta-analysis of information of link between lung cancer and radon exposure in living area is topical. Th e authors analyzed the most complete set of data on radon infl uence on human health, based on use of territory-wise aggregation of medical statistic materials and case-control research results. Summary covered also results of regression analysis of dependence of lung cancer mortality on average level of radon accumulation in buildings of Russian and US regions, and meta-analysis of over 30 case-control studies performed in various parts of the world. Th e study results support relations between lung cancer and radon irradiation in houses. To evaluate risk of lung cancer induced by radon, one can recommend value of 0.14 (with 90% confi dence interval 0.10–0.18) normalized for exposure to radon derivatives and corresponding to radon volumetric activity of 100 Bq/m3. Radon causes nearly 6% of lung cancer morbidity and mortality in Russia — that is over 3,000 new cases per year.

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Bătineţu-Giurgiu, D. M., and Neculai Stanciu. "Some geometric inequalities of Radon – Mitrinović." Journal of Mathematical Inequalities, no. 1 (2013): 25–32. http://dx.doi.org/10.7153/jmi-07-03.

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13

Thompson, A. A. "Sobolev Estimates for Singular Radon Transforms." Journal of Functional Analysis 112, no. 1 (February 1993): 61–96. http://dx.doi.org/10.1006/jfan.1993.1026.

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D'Agnolo, Andrea, and Pierre Schapira. "Radon–Penrose Transform for D-Modules." Journal of Functional Analysis 139, no. 2 (August 1996): 349–82. http://dx.doi.org/10.1006/jfan.1996.0089.

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15

Wójtowicz, Marek. "Isometries of Spaces of Radon Measures." Journal of Function Spaces 2017 (2017): 1–4. http://dx.doi.org/10.1155/2017/3850817.

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Let Ω and I denote a compact metrizable space with card(Ω)≥2 and the unit interval, respectively. We prove Milutin and Cantor-Bernstein type theorems for the spaces M(Ω) of Radon measures on compact Hausdorff spaces Ω. In particular, we obtain the following results: (1) for every infinite closed subset K of βN the spaces M(K), M(βN), and M(Ω2ℵ0) are order-isometric; (2) for every discrete space Γ with m≔card(Γ)>ℵ0 the spaces M(βΓ) and M(I2m) are order-isometric, whereas there is no linear homeomorphic injection from C(βT) into C(I2m).

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Wang, Shu Guang, Wei Yang, Qing Chen, Jian Hua Chen, and Cong Han. "Analysis of the Ventilation Effects on Radon-222 Exhalation in a Dead-End Tunnel." Applied Mechanics and Materials 713-715 (January 2015): 304–13. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.304.

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The regularity of radon exhalation rate in the over-broken granite tunnel is susceptible to weather conditions and ventilation styles. Based on the calculation model of radon exhalation in tunnel, some experiments have been carried out to analyze the variations of radon exhalation in cases of natural ventilation, blowing ventilation and exhaust ventilation separately. The results show that there is a linear relation between the radon exhalation and the natural ventilation quantity, and also between the radon exhalation and the ambient temperature; the radon exhalation in the case of exhaust ventilation is 63% higher than that in the blowing case under the condition of the same ventilation quantity and ambient temperature. Therefore, it is suggested that operation in the tunnel in high temperature be avoided in summer, and the blowing ventilation be adopted as an effective way for ventilation.

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Xie, Yan Shi, Kai Xuan Tan, Liang Chen, Kai Guang Hu, Zheng Qing Wang, and Xiu Cai Wang. "Fractal Analysis of Spatial Distribution of Radon Exhalation Rates of Uranium Mill Tailings." Advanced Materials Research 524-527 (May 2012): 584–87. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.584.

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A uranium mill tailings, located in Guangdong, was selected for spatial distribution of the radon exhalation rates measured by local static method. The two-dimension surface of radon exhalation rates was established by Surfer using the data of spatial distribution of radon exhalation rates measured at August 14, 2007 to 19 and 21, which was analyzed by fractal method of projective covering. The results show that the two-dimension surface of radon exhalation rates is of fractal structure. The fractal dimension of surface of radon exhalation rates from August 14, 2007 to 19 and 21 are 2.0535, 2.0173, 2.0029, 2.0084, 2.0079, 2.0057 and 2.0034, respectively, which indicates that the complexity of spatial distribution of the radon exhalation rates at 14 and 15 are larger than that of the other days. The phenomenon results from the change of precipitation and temperature, as well as the features of uranium mill tailings, including mineral composition, particle size, radium content, porosity and pore connectivity, etc.

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Rage, Estelle, David B. Richardson, Paul A. Demers, Minh Do, Nora Fenske, Michaela Kreuzer, Jonathan Samet, et al. "PUMA – pooled uranium miners analysis: cohort profile." Occupational and Environmental Medicine 77, no. 3 (January 31, 2020): 194–200. http://dx.doi.org/10.1136/oemed-2019-105981.

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ObjectivesEpidemiological studies of underground miners have provided clear evidence that inhalation of radon decay products causes lung cancer. Moreover, these studies have served as a quantitative basis for estimation of radon-associated excess lung cancer risk. However, questions remain regarding the effects of exposure to the low levels of radon decay products typically encountered in contemporary occupational and environmental settings on the risk of lung cancer and other diseases, and on the modifiers of these associations. These issues are of central importance for estimation of risks associated with residential and occupational radon exposures.MethodsThe Pooled Uranium Miner Analysis (PUMA) assembles information on cohorts of uranium miners in North America and Europe. Data available include individual annual estimates of exposure to radon decay products, demographic and employment history information on each worker and information on vital status, date of death and cause of death. Some, but not all, cohorts also have individual information on cigarette smoking, external gamma radiation exposure and non-radiological occupational exposures.ResultsThe PUMA study represents the largest study of uranium miners conducted to date, encompassing 124 507 miners, 4.51 million person-years at risk and 54 462 deaths, including 7825 deaths due to lung cancer. Planned research topics include analyses of associations between radon exposure and mortality due to lung cancer, cancers other than lung, non-malignant disease, modifiers of these associations and characterisation of overall relative mortality excesses and lifetime risks.ConclusionPUMA provides opportunities to evaluate new research questions and to conduct analyses to assess potential health risks associated with uranium mining that have greater statistical power than can be achieved with any single cohort.

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Filipović, Jelena, Dimitrije Maletić, Vladimir Udovičić, Radomir Banjanac, Dejan Joković, Mihailo Savić, and Nikola Veselinović. "The use of multivariate analysis of the radon variability in the underground laboratory and indoor environment." Nukleonika 61, no. 3 (September 1, 2016): 357–60. http://dx.doi.org/10.1515/nuka-2016-0059.

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Abstract The paper presents results of multivariate analysis of variations of radon concentrations in the shallow underground laboratory and a family house, depending on meteorological variables only. All available multivariate classification and regression methods, developed for data analysis in high-energy physics and implemented in the toolkit for multivariate analysis (TMVA) software package in ROOT, are used in the analysis. The result of multivariate regression analysis is a mapped functional behaviour of variations of radon concentration depending on meteorological variables only, which can be used for the evaluation of radon concentration, as well as to help with modelling of variation of radon concentration. The results of analysis of the radon concentration variations in the underground laboratory and real indoor environment, using multivariate methods, demonstrated the potential usefulness of these methods. Multivariate analysis showed that there is a potentially considerable prediction power of variations of indoor radon concentrations based on the knowledge of meteorological variables only. In addition, the online system using the resulting mapped functional behaviour for underground laboratory in the Institute of Physics Belgrade is implemented, and the resulting evaluation of radon concentrations are presented in this paper.

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Marennyy, A. M., D. V. Kononenko, and A. E. Trufanova. "Radon survey in Chelyabinsk Oblast, Russia, in 2008–2011. Analysis of spatial variability of indoor radon concentration." Radiatsionnaya Gygiena = Radiation Hygiene 13, no. 3 (October 3, 2020): 51–67. http://dx.doi.org/10.21514/1998-426x-2020-13-3-51-67.

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An extensive radon survey was conducted in 2008-2011 in the framework of the Federal target program on the territory of 29 districts of Chelyabinsk Oblast. SSNTDs were used to measure indoor radon concentrations in public buildings, dwellings and industrial buildings. The results are stored in the database “Radon” owned by Research and Technical Center of Radiation-Chemical Safety and Hygiene of Federal Medical-Biological Agency. The paper presents the results of the analysis of spatial variability of indoor radon concentration and the relationship of this value with a set of geological predictors of radon potential of the territory integrated into a map of ecological and radiogeochemical zones. The results show that in all districts and the whole Chelyabinsk Oblast radon concentrations conform to a lognormal distribution, but in ten districts log-logistic distribution fits the data slightly better. Nevertheless, relative difference between the median values of indoor radon concentration calculated from the two fitted distributions yields zero. The results show that dose assessment based on the arithmetic means could lead to an overestimation of the doses from radon in 1.4 times on average compared to that based on the medians. The median value does not exceed 400 Bq/m3 in any of the surveyed territories and the 95th percentile lies between 96 and 1274 Bq/m3. The fraction of indoor radon concentrations above 400 Bq/m3 expected from the fitted distribution lies between less than 0.1 and 26.8%. The highest values of this fraction were obtained for the Sosnovsky, Kaslinsky, Bredinsky districts and the Miassky urban district (except for the city of Miass). A map of ecological and radiogeochemical zones in Chelyabinsk Oblast was released in 1993-1995 and it was based on a set of geological predictors of radon potential of the territory. We analyzed the relationship of these zones with the results of the radon survey. One-way ANOVA on ranks with the Bonferroni correction showed that there is no statistically significant difference at the 95% confidence level amongst the medians of indoor radon concentration on basement, ground and first floors in settlements, which are located on the territory of three of four of these zones and outside of the territory of all zones. In the fourth zone the median was even two times lower than outside of the zones. These results lead to the conclusion that the possibility of using this map as a map of radon-prone areas is very doubtful. Each datapoint stored in the “Radon” database has a number of additional properties, which allows analyzing other types of indoor radon concentration variability such as seasonal or floor-to-floor. It is expected that later this dataset could be used for estimating regional seasonal correction factors.

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Ambrosino, Fabrizio, Lenka Thinová, Miloš Briestenský, and Carlo Sabbarese. "ANALYSIS OF RADON TIME SERIES RECORDED IN SLOVAK AND CZECH CAVES FOR THE DETECTION OF ANOMALIES DUE TO SEISMIC PHENOMENA." Radiation Protection Dosimetry 186, no. 2-3 (December 2019): 428–32. http://dx.doi.org/10.1093/rpd/ncz245.

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Abstract Anomalies in the radon (222Rn) releases in underground environments are one of the phenomena that can be observed before earthquake occurrence. Continuous measurements of radon activity concentration, and of meteorological parameters that influence the gas emission, were performed in three Slovak and Czech caves during 1-y period (1 July 2016–30 June 2017). The radon activity concentration in caves shows seasonal variations, with maxima reached during summer months. The anomalies in the radon time series are identified using a combination of three mathematical methods: multiple linear regression, empirical mode decomposition and support vector regression. The radon anomaly periods were compared with earthquake occurrences in Europe. Coincidences between both phenomena were found, since all monitored caves reflect contemporaneous local tectonic changes. The results indicate that radon continuous monitoring could assist a better understanding of radon emissions, along active tectonic structures, during seismic events.

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Aliyu, Abubakar Sadiq, Aminu Ismaila, A. M. Na'Inna, and Ahmed Mohammed. "MEASUREMENT OF RADON CONCENTRATION IN SOIL SAMPLES OF MAZAT AND KAFI-HABU MINING SITES, PLATEAU, NIGERIA." FUDMA JOURNAL OF SCIENCES 4, no. 4 (June 13, 2021): 295–301. http://dx.doi.org/10.33003/fjs-2020-0404-485.

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Radon and its short-lived progenies contributed significantly to natural background radiation. Long-term exposure to such radiation increases the probability of lung cancer to persons. To assess the radiological hazards associated with the inhalation of radon gas from ore dust in Mazat and Kafi-Habu mining sites of Plateau, Nigeria, 12 soil samples from an abandoned tailing dump ground were collected and analysed for radon using RAD-7 electronic detector. The dose rate of each sampling point was directly measured using RADOS RDS -120 portable survey meter. The results gave a mean radon concentration ranging from 771.51 ± 21.9 Bq/m3 to 5666.13 ± 28.8 Bq/m3 with 3451.13 ± 42.9 Bq/m3as the average value for all measurements. The average concentration of measurements from Mazat and Kafi-Habu is 3671.6 ± 41.2 Bq/m3 and 3010.16 ± 46.5 Bq/m3 respectively. The average values obtained from the analysis are significantly higher than the upper limit of 300 Bq/m3 set by the International Commission on Radiological Protection (ICRP) suggesting quick remediation on the host communities. The geometrical mean value of Dose Rate (DR) and Annual Effective Dose Equivalent (AEDE) were 870 nGy/hr and 1.04 mSv/yr respectively. Again, these values are above the global average limits of 59 nGy/hr and 1 mSv/yr. The result indicates that miners working in those sites and dwellers of the study areas are at higher risk of getting exposed to radon and need to employ protective measures. This work is useful in monitoring and control of radon level for the on-site workers and the

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Zhou, Cai-Li, and Fu-Gui Shi. "Lebesgue Decomposition Theorem and Weak Radon-Nikodým Theorem for Generalized Fuzzy Number Measures." Journal of Function Spaces 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/576134.

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Wu, Guang Zhi, Gang Fu, and Yan Jun Wu. "Detection and Parameter Estimation of Chirp Signal Based on Time-Frequency Analysis." Advanced Materials Research 989-994 (July 2014): 3989–92. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3989.

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Based on the relationship between the Radon-Wigner transform and fractional Fourier transform and the time frequency distribution, using the property that Radon-Wigner transform has better performance in time and frequency domain, detection and parameter estimation of Chirp signal have been done by Radon-Wigner transform or fractiona1 Fourier transform. The theoretica1 analysis and simulation prove that two techniques are better than generic time-frequency transform, such as Wigner-Ville transform.

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Airapetyan, Ruben G., and Alexander G. Ramm. "Singularities of the radon transform." Applicable Analysis 79, no. 3-4 (December 2001): 351–79. http://dx.doi.org/10.1080/00036810108840967.

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Strichartz, Robert S. "A fractal Radon inversion problem." Journal d'Analyse Mathématique 64, no. 1 (December 1994): 219–40. http://dx.doi.org/10.1007/bf03008410.

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Khan, Abdul Razzaq, Muhammad Rafique, Saeed Ur Rahman, Muhammad Basharat, Chand Shahzadi, and Ishtiaq Ahmed. "Geo-spatial analysis of radon in spring and well water using kriging interpolation method." Water Supply 19, no. 1 (April 4, 2018): 222–35. http://dx.doi.org/10.2166/ws.2018.070.

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Abstract Radon activity concentration was measured in 101 springs and well water samples collected from Muzaffarabad city and its outskirts. Sixty springs and 41 well water samples were analyzed, using RAD7, an electronic radon detector manufactured by Durridge Company Inc., for the estimation of radon borne activities and their relevant effects. Results obtained show that for spring water, the water borne radon activity varied from 0.246 ± 0.348 to 34.36 ± 5.54 Bq L−1 with an average value of 10.16 ± 2.42 Bq L−1. For well water, the water borne radon activity varied from 0.86 ± 0.10 to 16.12 ± 0.22 Bq L−1 with an average value of 4.21 ± 0.13 Bq L−1. Concentration of radon borne activities were subsequently used for determination of inhalation and ingestion doses. The inhalation and ingestion doses for spring water samples varied from 0.0062 ± 0.0087 to 0.865 ± 0.14 mSv y−1 and 0.052± 0.073 to 7.22 ± 1.16 mSv y−1, respectively. The inhalation and ingestion doses for well water varied from 0.022 ± 0.0025 to 0.41 ± 0.0054 mSv y−1 and 0.18± 0.021 to 3.38 ± 0.045 mSv y−1, respectively. 33.33% of spring and 7.32% of well water samples were found with values above the recommendation levels of the United States Environmental Protection Agency (∼11.1 Bq L−1). As a single measurement cannot serve as a best estimate of the unsampled areas in the region, Kriging interpolation method, a geo-statistical method, was used to get an estimate of spatial distribution of water borne radon in the area of study. Kriging mapping shows that higher radon concentrations are found in areas with lithology consisting of sandstones, siltstones, shales and claystones.

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Loffredo, Filomena, Antonio Scala, Guido Maria Adinolfi, Federica Savino, and Maria Quarto. "A new geostatistical tool for the analysis of the geographical variability of the indoor radon activity." Nukleonika 65, no. 2 (June 1, 2020): 99–104. http://dx.doi.org/10.2478/nuka-2020-0015.

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AbstractThe population is continuously exposed to a background level of ionizing radiation due to the natural radioactivity and, in particular, with radon (222Rn). Radon gas has been classified as the second leading cause of lung cancer after tobacco smoke [1]. In the confined environment, radon concentration can reach harmful level and vary accordingly to many factors. Since the primary source of radon in dwellings is the subsurface, the risk assessment and reduction cannot disregard the identification of the local geology and the environmental predisposing factors. In this article, we propose a new methodology, based on the computation of the Gini coefficients at different spatial scales, to estimate the spatial correlation and the geographical variability of radon concentrations. This variability can be interpreted as a signature of the different subsurface geological conditions. The Gini coefficient computation is a statistical tool widely used to determine the degree of inhomogeneity of different kinds of distributions. We generated several simulated radon distributions, and the proposed tool has been validated by comparing the variograms based on the semi-variance computation with those ones based on the Gini coefficient. The Gini coefficient variogram is shown to be a good estimator of the inhomogeneity degree of radon concentration. Indeed, it allows to better constrain the critical distance below which the radon geological source can be considered as uniform at least for the investigated length scales of variability; it also better discriminates the fluctuations due to the environmental predisposing factors from those ones due to the random spatially uncorrelated noise.

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Hinojosa de la Garza, Octavio R., Luz H. Sanín, María Elena Montero Cabrera, Korina Ivette Serrano Ramirez, Enrique Martínez Meyer, and Manuel Reyes Cortés. "Lung Cancer Mortality and Radon Concentration in a Chronically Exposed Neighborhood in Chihuahua, Mexico: A Geospatial Analysis." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/935380.

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This study correlated lung cancer (LC) mortality with statistical data obtained from government public databases. In order to asses a relationship between LC deaths and radon accumulation in dwellings, indoor radon concentrations were measured with passive detectors randomly distributed in Chihuahua City. Kriging (K) and Inverse-Distance Weighting (IDW) spatial interpolations were carried out. Deaths were georeferenced and Moran’sIcorrelation coefficients were calculated. The mean values (overn=171) of the interpolation of radon concentrations of deceased’s dwellings were 247.8 and 217.1 Bq/m3, for K and IDW, respectively. Through the Moran’sIvalues obtained, correspondingly equal to 0.56 and 0.61, it was evident that LC mortality was directly associated with locations with high levels of radon, considering a stable population for more than 25 years, suggesting spatial clustering of LC deaths due to indoor radon concentrations.

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Distenfeld, Carl, Jacquelyn Distenfeld, and Lois Distenfeld. "Radon Measurements and Analysis for Central Pennsylvania Counties Having Elevated Radon Levels." Health Physics 80 (May 2001): S55—S61. http://dx.doi.org/10.1097/00004032-200105001-00006.

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Laurier, D., J. W. Marsh, E. Rage, and L. Tomasek. "Miner studies and radiological protection against radon." Annals of the ICRP 49, no. 1_suppl (July 31, 2020): 57–67. http://dx.doi.org/10.1177/0146645320931984.

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Fundamental estimates of radon-associated health risk have been provided by epidemiological studies of miners. In total, approximately 15 studies have been conducted worldwide since the 1960s. These results have contributed directly to radiological protection against radon. The present article summarises the main results, with a focus on analyses of miners exposed more recently, estimates of radon lifetime attributable risk, and interaction between radon and smoking. The potential for the upcoming Pooled Uranium Miner Analysis project to further improve our knowledge is discussed.

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Rubin, Boris, and Yingzhan Wang. "Riesz potentials and orthogonal radon transforms on affine Grassmannians." Fractional Calculus and Applied Analysis 24, no. 2 (April 1, 2021): 376–92. http://dx.doi.org/10.1515/fca-2021-0017.

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Abstract We establish intertwining relations between Riesz potentials associated with fractional powers of minus-Laplacian and orthogonal Radon transforms 𝓡 j,k of the Gonzalez-Strichartz type. The latter take functions on the Grassmannian of j-dimensional affine planes in ℝ n to functions on a similar manifold of k-dimensional planes by integration over the set of all j-planes that meet a given k-plane at a right angle. The main results include sharp existence conditions of 𝓡 j,k f on L p -functions, Fuglede type formulas connecting 𝓡 j,k with Radon-John k-plane transforms and Riesz potentials, and explicit inversion formulas for 𝓡 j,k f under the assumption that f belongs to the range of the j-plane transform. The method extends to another class of Radon transforms defined on affine Grassmannians by inclusion.

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Yarmoshenko, I. V., A. D. Onishchenko, G. P. Malinovsky, A. V. Vasilyev, E. I. Nazarov, and M. V. Zhukovsky. "Comparative analysis of radon concentrations in buildings of different energy efficiency classes on example of five Russian cities." Radiatsionnaya Gygiena = Radiation Hygiene 13, no. 2 (June 25, 2020): 47–56. http://dx.doi.org/10.21514/1998-426x-2020-13-2-47-56.

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A comparative analysis of the radon concentrations in modern multi-storey residential buildings of high energy efficiency class and buildings typical for urban areas of the twentieth century was carried out. The study was conducted in Russian cities located in various climatic zones – Ekaterinburg, Krasnodar, St. Petersburg, Salekhard, Chelyabinsk. The radon concentration in samples of buildings was measured using integrated radon radiometers based on nuclear track detectors according to a single method. The surveyed sample included 498 apartments in multi-apartment buildings. Among all the examined building types, the highest average radon concentration is observed in modern energy-efficient houses – 43 Bq/m3. In other types of buildings, the following average radon concentrations were obtained: brick 2–5 floors – 35 Bq/m3; panel 5 floors – 32 Bq/m3; panel 7–12 floors 1970-1990 years of construction – 22 Bq/m3; brick> 5 floors 1970–1980 years of construction – 20 Bq m3; panel, built since 1990 – 24 Bq/m3. The results of the study confirm the assumption that radon concentration in modern multi-storey energy-efficient houses is on average higher than in typical residential buildings of the Soviet period. The increased accumulation of radon in energy-efficient buildings is associated with a decrease in the building envelope permeability and the contribution of fresh air to the general air exchange. Despite the fact that there were no cases of exceeding hygienic standards for the indoor radon concentration in the framework of this study, the higher radon concentration in buildings of increased energy efficiency requires attention from the point of view of implementing the principle of optimization of radiation protection. In the future, extensive construction of energy-efficient buildings may increase the average and collective doses to the urban population in the Russian Federation.

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Schwenke, James R., and Michael D. Butine. "The analysis of radon survey data." Environmetrics 5, no. 1 (March 1994): 71–82. http://dx.doi.org/10.1002/env.3170050107.

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Lenzen, M., and H. J. Neugebauer. "Analysis of Quasicontinuous Radon Monitor Response." Health Physics 74, no. 1 (January 1998): 64–70. http://dx.doi.org/10.1097/00004032-199801000-00007.

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Moon, Sunghwan, and Joonghyeok Heo. "Inversion of the elliptical Radon transform arising in migration imaging using the regular Radon transform." Journal of Mathematical Analysis and Applications 436, no. 1 (April 2016): 138–48. http://dx.doi.org/10.1016/j.jmaa.2015.11.043.

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Janik, Mirosław, and Peter Bossew. "Analysis of simultaneous time series of indoor, outdoor and soil air radon concentrations, meteorological and seismic data." Nukleonika 61, no. 3 (September 1, 2016): 295–302. http://dx.doi.org/10.1515/nuka-2016-0049.

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Abstract It is well known that the temporal dynamic of indoor and outdoor radon concentrations show complex patterns, which are partly not easy to interpret. Clearly, for physical reasons, they must be related to possibly variable conditions of radon generation, migration and atmospheric dispersion and accumulation. The aim of this study was to analyse long-time series of simultaneously measured indoor and outdoor radon concentrations, together with environmental quantities, which may act as control variables of Rn. The study was performed in Chiba, Japan, using two ionization chambers for parallel indoor and outdoor radon concentrations measurements over 4 years. Meteorological and seismic data were obtained from the Japan Metrological Agency (JMA).

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Mirek, Mariusz. "Square function estimates for discrete Radon transforms." Analysis & PDE 11, no. 3 (January 1, 2018): 583–608. http://dx.doi.org/10.2140/apde.2018.11.583.

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Vasilyev, A., I. Yarmoshenko, A. Onishchenko, M. Hoffmann, G. Malinovsky, A. Marenny, and L. Karl. "RADON MEASUREMENTS IN BIG BUILDINGS: PILOT STUDY IN RUSSIA." Radiation Protection Dosimetry 191, no. 2 (September 2020): 214–18. http://dx.doi.org/10.1093/rpd/ncaa150.

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Abstract Detailed analysis of indoor radon concentration distribution by floors was conducted in four children institutions, one office building and two residential houses in Russian cities to develop approaches to draw up a program of radon survey for big buildings. Higher variability of radon concentration was found in high geogenic radon potential (GRP) area when the soil is the main source of radon. No essential dependence of radon concentration on the floor in high-rise buildings was found in low GRP area. The number of required radon measurements is estimated using obtained characteristics of radon variability.

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Stojanovska, Zdenka, Kremena Ivanova, Peter Bossew, Blazo Boev, Zora Zunic, Martina Tsenova, Zoran Curguz, Predrag Kolarz, Milka Zdravkovska, and Mimoza Ristova. "Prediction of long-term indoor radon concentration based on short-term measurements." Nuclear Technology and Radiation Protection 32, no. 1 (2017): 77–84. http://dx.doi.org/10.2298/ntrp1701077s.

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We present a method for the estimation of annual radon concentration based on short-term (three months) measurements. The study involves results from two independent sets of indoor radon concentration measurements performed in 16 cities of the Republic of Macedonia. The first data set contains winter and annual radon concentration obtained during the National survey in 2010 and the second, contains only the radon concentration measured during the winter of 2013. Both data sets pertain to radon concentration from the same cities and have been measured applying the same methodology in ground floor dwellings. The results appeared to be consistent and the dispersion of radon concentration was low. Linear regression analysis of the radon concentration measured in winter of 2010 and of the 2010 annual radon concentration revealed a high coefficient of determination R2 = 0.92, with a relative uncertainty of 3%. Furthermore, this model was used to estimate the annual radon concentration solely from winter-term measurements performed in 2013. The geometrical mean of the estimated annual radon concentration of the 2013: radon concentration (A-2013) =98 Bqm-3 was almost equal to the geometrical mean of the annual radon concentration from the 2010, radon concentration (A-2010) = 99 Bqm-3. Analysis of the influence of building characteristics, such as presence/absence of a basement in the building, or the dominant building material on the estimated annual radon concentration is also reported. Our results show that a low number of relatively short-term radon measurements may produce a reasonable insight into a gross average obtained in a larger survey.

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Turtiainen, Tuukka, and Laina Salonen. "Prevention measures against radiation exposure to radon in well waters: analysis of the present situation in Finland." Journal of Water and Health 8, no. 3 (December 4, 2009): 500–512. http://dx.doi.org/10.2166/wh.2009.067.

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Naturally occurring radioactive elements are found in all groundwaters, especially in bedrock waters. Exposure to these radioactive elements increases the risk of cancer. The most significant of these elements is radon which, as a gas, is mobile and dissolves in groundwater. In Finland, water supply plants are obliged to carry out statutory monitoring of the water quality, including radon. Monitoring of private wells, however, is often neglected. In this paper, we outline the problem by reviewing the outcomes of the studies conducted in Finland since the 1960s. We also summarise the development of legislation, regulations and political decisions made so far that have affected the amount of public exposure to radon in drinking water. A review of the studies on radon removal techniques is provided, together with newly obtained results. New data on the transfer of radon from water into indoor air are presented. The new assessments also take into account the expanding use of domestic radionuclide removal units by Finnish households.

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Lebed, O. O., M. O. Klymenko, A. V. Lysytsya, and V. O. Myslinchuk. "Effect of Radon on oncological morbidity of the population: comparative analysis of some regions of Ukraine and France." Ukrainian Journal of Ecology 8, no. 1 (February 28, 2018): 585–95. http://dx.doi.org/10.15421/2018_253.

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Radon contributes about 50% to the total annual effective dose of human radioactive irradiation. This gas is the main radiological pollutant of ecosystems. The question of studying the effect of radon on increasing the risk of the incidence of lung cancer is relevant in the context of European sanitary and hygienic research. We give in this article a comparative description of the results of experimental studies of volumetric activity of radon inside the air of the first floors of residential premises in Corsica island (France) and town of Rivne (Ukraine). «Kodak-alpha» integrated solid-state track detectors were used in France for three measurement campaigns between 1990 and 1999 (152 measurements in residential buildings and 638 in the schools of the island). In Ukraine, we did research using the “Alfarad Plus” Express Radon meter from 2013 to 2017 (200 measurements in the apartments of the first floors of buildings). The regions studied are similar in several parameters, which affect the increase in the percentage of cancer diseases: geology of underlying soils, the structure of housing and building material, the number of people and incidence of lung cancer, smoking factor, etc. We found that the volume activity (VA) of radon in indoor air in-house compared regions have close in value. The main reason is the similarity of the underlying granites in terms of radon emanation power. The average geometric value of radon VA in living quarters for various measurement campaigns in Corsica is in the range from 81 to 152 Bq/m3 (the average of them is 134 Bq/m3). This value for Rivne is 127 Bq/m3. VA of radon in residential areas of Rivne have a lognormal distribution. Building norms for equivalent equilibrium volumetric activity (EEVA) of radon in the premises of Rivne are exceeded in 6.6% of buildings, Corsica - from 6 to 10% (this depends on the measurement campaign). Here, the average concentration of radon in housing is over 400 Bq/m3. We calculated the relative risk of lung cancer incidence due to radon for the population of the studied regions. The Jacobi and BEIR-VI models were used for Rivne for 70 years of exposure, and the BEIR-VI model was taken for Corsica for 110 years of exposure. The proportion of deaths from lung cancer is in Corsica from 30 to 48%, while for Rivne - about 50%. Consequently, the percentages of deaths from lung cancer caused by radon with an average value of VA in housing 134 Bq/m3, for men and women Corsica are 21.3% and 22.6% respectively (21.5% for the entire population) of the total number of deaths from this disease. In the quantitative form it is 33 people (men - 28, women - 5) out of 155 people died for a year from lung cancer. For residents of Rivne, the percentage of deaths from lung cancer is 25.1%, average value of VA in housing is 127 Bq/m3. 53 people die on average for a year from lung cancer caused by radon (men - 47, women - 6) of 214 deaths per year lung cancer lot. A preliminary assessment of the synergistic interaction between smoking and radon showed that there could be a 50% increase in morbidity due to radon for smokers, compared to non-smokers. However, these data are not sufficiently representative and therefore further research is needed.Rivne; Corsica; living rooms; volumetric activity of radon; lung cancer

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Ung Lim, Hyun, Su Jeong Pyeon, and Sang Soo Lee. "Radon Gas Adsorption Properties of Non-Cement Matrix Using Anthracite." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 585. http://dx.doi.org/10.14419/ijet.v7i3.34.19387.

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Background/Objectives: Recently, research on minimizing the exposure of radon in human environment is under way due to the threat of exposure to radiation, which is a problem in the world.Methods/Statistical analysis: This study is about the production of Radon Radiation Absorbing Hardeners for radon - emitting materials in indoor environment of human body. The anthracite used as a conventional filter medium was used as a radon adsorbent and the characteristics of an adsorbed cured body for the replacement ratio of anthracite were analyzed.Findings: As a result of the analysis of the experimental results, the results of the measurement of the radon gas concentration are as follows. And the adsorption effect on the half - life period of 3.8 days of radon gas was investigated. The adsorption properties of radon gas showed similar tendency irrespective of the measurement period. The longer the period, the more the concentration of radon gas was constant.Improvements/Applications: As a result of this study, the concentration of radon gas tended to decrease as the anthracite replacement ratio increased, which was not related to the duration of the measurement period of 3 days and 7 days. It is considered that the average data analysis is needed through long-term measurement of radon gas, and additional experiments are required considering the space and spatial characteristics. In addition, performance evaluation of other adsorbents is also considered necessary.

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Li, Cong, Chunhong Wang, Jun Yu, Yongsheng Fan, Duanya Liu, Wenshan Zhou, and Tingming Shi. "Residential Radon and Histological Types of Lung Cancer: A Meta-Analysis of Case‒Control Studies." International Journal of Environmental Research and Public Health 17, no. 4 (February 24, 2020): 1457. http://dx.doi.org/10.3390/ijerph17041457.

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Epidemiological studies on residential radon exposure and the risk of histological types of lung cancer have yielded inconsistent results. We conducted a meta-analysis on this topic and updated previous related meta-analyses. We searched the databases of Cochrane Library, Embase, PubMed, Web of Science and Chinese National Knowledge Infrastructure for papers published up to 13 November 2018. The pooled odds ratio (OR) and 95% confidence interval (CI) were calculated using fixed and random effects models. Subgroup and dose‒response analyses were also conducted. This study was registered with PROSPERO (No. CRD42019127761). A total of 28 studies, which included 13,748 lung cancer cases and 23,112 controls, were used for this meta-analysis. The pooled OR indicated that the highest residential radon exposure was significantly associated with an increased risk of lung cancer (OR = 1.48, 95% CI = 1.26–1.73). All histological types of lung cancer were associated with residential radon. Strongest association with small-cell lung carcinoma (OR = 2.03, 95% CI = 1.52–2.71) was found, followed by adenocarcinoma (OR = 1.58, 95% CI = 1.31–1.91), other histological types (OR = 1.54, 95% CI = 1.11–2.15) and squamous cell carcinoma (OR = 1.43, 95% CI = 1.18–1.74). With increasing residential radon levels per 100 Bq/m3, the risk of lung cancer, small-cell lung carcinoma and adenocarcinoma increased by 11%, 19% and 13%, respectively. This meta-analysis provides new evidence for a potential relationship between residential radon and all histological types of lung cancer.

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Cuccagna, Scipio. "Sobolev Estimates for Fractional and Singular Radon Transforms." Journal of Functional Analysis 139, no. 1 (July 1996): 94–118. http://dx.doi.org/10.1006/jfan.1996.0080.

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Cascales, B., A. Pérez, and M. Raja. "Radon–Nikodým indexes and measures of weak noncompactness." Journal of Functional Analysis 267, no. 10 (November 2014): 3830–58. http://dx.doi.org/10.1016/j.jfa.2014.09.015.

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Kondratiev, Yuri, Eugene Lytvynov, and Anatoly Vershik. "Laplace operators on the cone of Radon measures." Journal of Functional Analysis 269, no. 9 (November 2015): 2947–76. http://dx.doi.org/10.1016/j.jfa.2015.06.007.

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48

Agranovsky, Mark. "Non-central Funk-Radon transforms: Single and multiple." Journal of Functional Analysis 279, no. 8 (November 2020): 108701. http://dx.doi.org/10.1016/j.jfa.2020.108701.

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49

Thompson, Alan A. "A Singular Radon Transform on RP3." Communications in Partial Differential Equations 14, no. 11 (January 1989): 1461–70. http://dx.doi.org/10.1080/03605308908820663.

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Gel'fand, I. M., V. V. Minakhin, and V. N. Shander. "Integration on supermanifolds and Radon supertransformations." Functional Analysis and Its Applications 20, no. 4 (1987): 310–12. http://dx.doi.org/10.1007/bf01083498.

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Journal articles on the topic 'Radon analysis'

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