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Relevant bibliographies by topics / Thermoluminescent dosimetric system

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Academic literature on the topic 'Thermoluminescent dosimetric system'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Thermoluminescent dosimetric system"

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Gasiorowski, Andrzej, Piotr Szajerski, and Jose Francisco Benavente Cuevas. "Use of Terbium Doped Phosphate Glasses for High Dose Radiation Dosimetry—Thermoluminescence Characteristics, Dose Response and Optimization of Readout Method." Applied Sciences 11, no. 16 (2021): 7221. http://dx.doi.org/10.3390/app11167221.

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The phosphate glass samples doped with Tb2O3 oxide (general formula: P2O5-Al2O3-Na2O-Tb2O3) were synthesized and studied for usage in high-dose radiation dosimetry (for example, in high-activity nuclear waste disposals). The influence of terbium concentration on thermoluminescent (TL) signals was analyzed. TL properties of glasses were investigated using various experimental techniques such as direct measurements of TL response vs. radiation dose, Tmax–Tstop and VHR (various heating rate) methods, and glow curve deconvolution analysis. The thermoluminescence dosimetry (TLD) technique was used as the main investigation tool to study detectors’ dose responses. It has been proved that increasing the concentration of terbium oxide in glass matrices significantly increases the thermoluminescence yield of examined material. For the highest dose range (up to 35 kGy), the dependence of the integrated thermoluminescent signals vs. dose can be considered as a saturation-type curve. Additional preheating of samples improves linearity of signal vs. dose dependencies and leads to a decrease of the signal loss over time. All obtained data suggest that investigated material can be used in high-dose radiation dosimetry. Additional advantages of the investigated dosimetric system are its potential ability to re-use the same dosimeters multiple times and the fact that reading dosimeters only requires usage of a basic TL reader without any modifications.

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Novario, Raffaele, Paola Stucchi, Lucia Perna, and Leopoldo Conte. "Radiotherapy Treatment Verification." Tumori Journal 84, no. 2 (1998): 144–49. http://dx.doi.org/10.1177/030089169808400209.

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During a radiotherapy treatment, a dosimetric verification or a geometric localization can be done, in order to assess the quality of the treatment. The dosimetric verification is generally performed measuring the dose at some points inside (natural cavities) or outside the patient, and comparing it to the dose at the same points calculated and predicted by the treatment planning system. This can be done either with thermoluminescent or diodes dosimeters or with ionization chambers. The geometric localization can be done acquiring a portal image of the patient. Portal imaging can be performed either with films placed between metallic screens, or with an electronic portal imaging device such as fluoroscopic systems, solid state devices or matrix ionization chamber systems. In order to assess possible field placement errors, the portal images have to be compared with images obtained with the simulator in the same geometric conditions and/or with the digitally reconstructed radiograph (DRR) obtained with the treatment planning system. In particular, when using matrix ionization chamber systems, the portal images contain also information regarding the exit dose. This means that this kind of imaging device can be used both for geometric localization and for dosimetric verification. In this case, the exit dose measured by the portal image can be compared with the exit dose calculated and predicted by the treatment planning system. Some “in-vivo” applications of this methodology are presented.

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Radaideh, Khaldoon M., Laila M. Matalqah, A. A. Tajuddin, W. I. Fabian Lee, S. Bauk, and E. M. Eid Abdel Munem. "Development and evaluation of a Perspex anthropomorphic head and neck phantom for three dimensional conformal radiation therapy (3D-CRT)." Journal of Radiotherapy in Practice 12, no. 3 (2013): 272–80. http://dx.doi.org/10.1017/s1460396912000453.

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AbstractPurposesTo design, construct and evaluate an anthropomorphic head and neck phantom for the dosimetric evaluation of 3D-conformal radiotherapy (3D-CRT) dose planning and delivery, for protocols developed by the Radiation Therapy Oncology Group (RTOG).Materials and methodsAn anthropomorphic head and neck phantom was designed and fabricated using Perspex material with delineated planning target volumes (PTVs) and organs at risk (OARs) regions. The phantom was imaged, planned and irradiated conformally by a 3D-CRT plan. Dosimetry within the phantom was assessed using thermoluminescent dosimeters (TLDs). The reproducibility of phantoms and TLD readings were checked by three repeated identical irradiations. Subsequent three clinical 3D-CRT plans for nasopharyngeal patients have been verified using the phantom. Measured doses from each dosimeter were compared with those acquired from the treatment planning system (TPS).ResultsPhantom's measured doses were reproducible with <3·5% standard deviation between the three TLDs’ repeated measurements. Verification of three head and neck 3D-CRT patients’ plans was implemented, and good agreement between measured values and those predicted by TPS was found. The percentage dose difference for TLD readings matched those corresponding to the calculated dose to within 4%.ConclusionThe good agreement between predicted and measured dose shows that the phantom is a useful and efficient tool for 3D-CRT technique dosimetric verification.

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Yu, Cheng, Gabor Jozsef, Michael L. J. Apuzzo, and Zbigniew Petrovich. "Measurements of the Relative Output Factors for CyberKnife Collimators." Neurosurgery 54, no. 1 (2004): 157–62. http://dx.doi.org/10.1227/01.neu.0000097328.54068.44.

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Abstract OBJECTIVE To determine accurately the relative output factors, defined as the ratio of the nominal dose rate for a given collimator to that of the 60-mm collimator. This is particularly important for radiosurgical treatment of functional disorders, such as trigeminal neuralgia, in which a single large radiation dose is delivered to the target with a small collimator, such as the 5-mm collimator for CyberKnife radiosurgery. Numerous studies on the output factors have been reported for the Leksell gamma knife unit but none for the CyberKnife system. METHODS Measurements of the relative output factors for all 12 collimators were performed by three different methods: silicon diode, radiographic film, and thermoluminescent dosimetry microcubes. The silicon diode is designed for measurements in small (1–50 MV) photon beams performed in water or air. Film and thermoluminescent dosimetry measurements were performed in a plastic phantom. RESULTS The measured relative output factors for the three methods were very similar except for the three smallest collimators (5, 7.5, and 10 mm). The measured difference between the above methods was approximately 2%. The mean value of the output factor for the 5-mm collimator was 0.686 ± 0.024. The uncertainties of the output factors are expected to increase with the decrease of collimator diameter. They range from approximately 1 to 4% of the relative output factor. CONCLUSION The relative output factor can be measured with an acceptable accuracy even for the smallest (5-mm) CyberKnife collimators. This requires the selection of appropriate dosimetric detectors and measuring procedures. The results obtained with the diode are considered more accurate than with the other two methods.

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Sobotka, Piotr, Bartłomiej Kliś, Zuzanna Baranowska, Katarzyna Wołoszczuk, Katarzyna Rutkowska, and Tomasz Woliński. "Efficient reading of thermoluminescent dosimeter signals using semiconductor detectors." Nukleonika 65, no. 4 (2020): 223–27. http://dx.doi.org/10.2478/nuka-2020-0034.

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AbstractThe aim of this experimental work was to examine whether semiconductor photodetectors may be applied for the efficient reading of thermoluminescent dosimeter (TLD) signals. For this purpose, a series of experiments have been performed at the Department of Physics, Warsaw University of Technology, in cooperation with the Central Laboratory for Radiological Protection (CLOR). Specifically, the measurement system proposed here has been designed to detect a signal from TLDs that use a semiconductor detector operating in conditions analogous to those met when using commercial devices equipped with a classic photomultiplier. For the experimental tests, the TLDs were irradiated with a beam of 137Cs radiation in the accredited Laboratory for Calibration of Dosimetric and Radon Instruments. Eventually, a comparison of the results obtained with a semiconductor detector (ID120) and a commercial TLD reader with a photomultiplier tube (RADOS) were made.

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Rueda, Alexis N., César Ruiz-Trejo, Eduardo López-Pineda, Mario E. Romero-Piña, and Luis A. Medina. "Dosimetric Evaluation in Micro-CT Studies Used in Preclinical Molecular Imaging." Applied Sciences 11, no. 17 (2021): 7930. http://dx.doi.org/10.3390/app11177930.

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In microCT imaging, there is a close relationship between the dose of radiation absorbed by animals and the image quality, or spatial resolution. Although the radiation levels used in these systems are generally non-lethal, they can induce cellular or molecular alterations that affect the experimental results. Here, we describe a dosimetric characterization of the different image acquisition modalities used by the microCT unit of the Albira microPET/SPECT/CT scanner, which is a widely used multimodal imaging system in preclinical research. The imparted dose at the animal surface (IDS) was estimated based on Boone’s polynomial interpolation method and experimental measurements using an ionization chamber and thermoluminescent dosimeters. The results indicated that the imparted dose at surface level delivered to the mice was in the 30 to 300 mGy range. For any combination of current (0.2 or 0.4 mA) and voltage (35 or 45 kV), in the Standard, Good, and Best image acquisition modalities, the dose imparted at surface level in rodents was below its threshold of deterministic effects (250 mGy); however, the High Res modality was above that threshold.

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Radaideh, Khaldoon. "Evaluation of thermoplastic Klarity mask use during intensity-modulated radiation therapy for head and neck carcinoma." Journal of Radiotherapy in Practice 17, no. 2 (2018): 171–78. http://dx.doi.org/10.1017/s1460396917000632.

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AbstractAimTo evaluate the Klarity® Mask with respect to skin doses and toxicity secondary to head and neck cancer radiation treatment.Materials and methodsThis prospective study included five nasopharyngeal cancer patients who underwent intensity-modulated radiation therapy and monitored for skin toxicity. An anatomical Perspex head and neck phantom was designed and used. All patients’ treatment plans were separately transferred to the phantom. Dosimetric measurements were performed using chip-shaped thermoluminescent dosimeters (LiF:Mg,Ti TLDs) which were distributed at certain target points on the phantom. Phantom was irradiated twicely with and without a Klarity® Mask. Three fractions for each patient plan were obtained and compared with treatment planning system (TPS) doses as guided by computed tomography.ResultsThe Klarity mask used for patient immobilisation increased the surface dose by 10·83% more than that without the mask. The average variations between skin dose measurements with and without the Klarity mask for all patients’ plans ranged from 10·26 to 11·83%. TPS overestimated the surface dose by 19·13% when compared with thermoluminescent dosimeters that measured the direct skin dose.ConclusionsKlarity immobilisation mask increases skin doses, as a consequence, surface dose measurements should be monitored and must be taken into account.

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Lee, J. H., L. T. Chang, A. C. Shiau, et al. "A Novel Simple Phantom for Verifying the Dose of Radiation Therapy." BioMed Research International 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/934387.

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A standard protocol of dosimetric measurements is used by the organizations responsible for verifying that the doses delivered in radiation-therapy institutions are within authorized limits. This study evaluated a self-designed simple auditing phantom for use in verifying the dose of radiation therapy; the phantom design, dose audit system, and clinical tests are described. Thermoluminescent dosimeters (TLDs) were used as postal dosimeters, and mailable phantoms were produced for use in postal audits. Correction factors are important for converting TLD readout values from phantoms into the absorbed dose in water. The phantom scatter correction factor was used to quantify the difference in the scattered dose between a solid water phantom and homemade phantoms; its value ranged from 1.084 to 1.031. The energy-dependence correction factor was used to compare the TLD readout of the unit dose irradiated by audit beam energies with60Co in the solid water phantom; its value was 0.99 to 1.01. The setup-condition factor was used to correct for differences in dose-output calibration conditions. Clinical tests of the device calibrating the dose output revealed that the dose deviation was within 3%. Therefore, our homemade phantoms and dosimetric system can be applied for accurately verifying the doses applied in radiation-therapy institutions.

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Murthy, K. V. R. "Applications of TLDs in Radiation Dosimetry." Defect and Diffusion Forum 341 (July 2013): 211–30. http://dx.doi.org/10.4028/www.scientific.net/ddf.341.211.

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An increasing amount of public interest in environmental monitoring programmes is being focused on the environmental impact of radiation arising from nuclear power operations and the corresponding detection of slight variations in the natural radiation background. The primary objective of individual monitoring for external radiation is to assess, and thus limit, radiation doses to individual workers. Supplementary objectives are to provide information about the trends of these doses and about the conditions in places of work and to give information in the event of accidental exposure. Depending on the kind of radiation hazard, the ICRP recommended maximum permissible dose (MPD) values. These are the maximum dose equivalent values, which are not expected to cause appreciable body injury to a person during his lifetime. Thermoluminescent Dosimetry (TLD) has been developed during 1960-70 for various applications in medicine and industry. TLD, the most advanced and most intensively studied integrating dosimeter system, has now reached the stage at which it may replace or supplement film dosimetry. TLD systems are widely applied to environmental monitoring programmes near nuclear installations. TLD systems with high reproducibility in the milli roentgen dose range are required in order to measure exposures equal to that resulting from an exposure rate of 10μR h-1 during field periods of from several days up to a year. A brief list of applications specific to radiation oncology is given here. In radiation oncology dosimetric accuracy demanded is of the order of 2-5%. TLDs offer a clear solution since their precision meets this criteria. Contents

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Atari, Nader A., and Göran K. Svensson. "A high-resolution digital dosimetric system for spatial characterization of radiation fields using a thermoluminescent CaF2 :Dy crystal." Medical Physics 13, no. 3 (1986): 354–60. http://dx.doi.org/10.1118/1.595875.

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Dissertations / Theses on the topic "Thermoluminescent dosimetric system"

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Santos, Lindomar Soares dos. "Implementação de um sistema dosimétrico termoluminescente para utilização em dosimetria in vivo em teleterapia com feixes de fótons de energia alta." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-12052008-150030/.

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A dosimetria in vivo é a verificação final da dose real administrada ao paciente e tornou-se atualmente necessária devido ao aumento da complexidade e da sofisticaçã das técnicas radioterápicas. A finalidade deste trabalho foi apresentar, verificar e avaliar alguns procedimentos básicos, práticos e viáveis para a implementação da dosimetria in vivo com dosímetros termoluminescentes na verificação de dose em um serviço de radioterapia. Para o estabelecimento do sistema dosimétrico termoluminescente, alguns testes e medições foram realizados, incluindo o procedimento de inicialização, a determinação da homogeneidade do grupo de dosímetros, a determinação do fator de correção individual de cada dosímetro, a determinação da faixa de linearidade do sistema e do coeficiente de calibração. Medições em um objeto simulador antropomórfico foram realizadas para garantir que os métodos utilizados são satisfatórios antes que estes fossem usados para medições em pacientes. Medições de dose em um paciente foram feitas em um tratamento de câncer de próstata. A metodologia proposta pode ser usada como parte de um programa de garantia de qualidade em um serviço de radioterapia.<br>In vivo dosimetry is the ultimate check of the actual dose delivered to an individual patient and has become a procedure actually necessary due to increasing complexity and sophistication of radiotherapy techniques. The purpose of the present work was to present, verify and evaluate some basic, practical and viable procedures for the implementation of in vivo dosimetry with thermoluminescent dosimeters for patient dose verification at a radiotherapy service. For the setting up of the thermoluminescent dosimetric system, several tests and measurements were carried out including the initialisation procedure, the determination of the batch homogeneity, the determination of individual correction factor of each dosimeter, the determination of linearity range of the system and its calibration coefficients. Anthropomorphic phantom measurements were taken to ensure that the methods are satisfactory before they are used for patients measurements. Patient dose measurements were carried out in a prostate cancer treatment. The proposed methodology can be used as a part of a quality assurance program in a radiotherapy service.

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FUKUMORI, DAVID T. "Desenvolvimento e estudo de materiais termoluminescentes baseados em óxido de alumínio para aplicação em dosimetria." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9931.

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Made available in DSpace on 2014-10-09T12:32:58Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:11Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Broadhead, Dawn. "Large scale entrance surface dose survey and organ dose measurements during diagnostic radiology using the Harshaw 5500 and 6600 TLD systems." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366517.

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Chen, Yan Shi, and 陳妍希. "Establishing thermoluminescent dosimetric system in proton therapy: evaluation of radiation dose and average linear energy transfer." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/656uc8.

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碩士<br>長庚大學<br>醫學影像暨放射科學系<br>104<br>Linko Chang Gung Memorial Hospital (CGMH) has built the first proton therapy center in Taiwan. The standard dosimetry system is the ionization chamber. Establishing the secondary dosimetry systems such as film and TLD are also important, because it can verify the standard one and compensate to each other. The thermoluminescent dosimeter (TLD) system is widely used in radiation measurement especially for radiation oncology. Because the interaction between proton and TLD is different from photon, it is necessary to reestablish the TLD system and consider the characteristics of TLD for proton therapy. The purpose of this work is to establish the TLD system in proton therapy for the evaluation of radiation dose and the average linear energy transfer (LET). In this study, we used two kinds of thermoluminescent dosimeter, one is TLD100 and the other is high sensitive MCP100. Establishing the TLD dosimetry system included calibration and characteristic evaluation”. Because the responses of TLD100 and MCP100 have different relation to proton energy, we used this relation to evaluate the proton energy and the average linear energy transfer. Calibration included reproducibility, dose dependence and energy dependence. We selected the TLDs with well reproducibility. The relation is linear between dose and TL response for TLD100 and MCP100. MCP100 has energy dependence, and the TL response will decrease when proton energy become lower. TLD100 has no significant energy dependence. In this study, we used TLD100 as the dose measurement tool and the overall uncertainty is 3.47 % with energy correction. Without energy correction, the overall uncertainty is 8.79 %. Characteristic evaluation included fading effect, residual dose and energy loss of proton. For the fading effect, we suggest TLD should be readout within 3 days after exposure. The residual dose depends on the annealing procedure, we use 400 °C for 1 hour and 100 °C for 2 hour for TLD100, 240 °C for 10 minutes for MCP100. When the high-energy protons interact with TLD, TLD will attenuate the proton energy especially for low-energy protons (< 50 MeV). Combination of TLD100 and MCP100 thermoluminescent dosimeter system can measure proton dose, the average proton energy, and the average linear energy transfer at the same time with the evaluation of overall uncertainty.

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PETROVÁ, Irena. "Systém elektronické osobní dozimetrie." Master's thesis, 2008. http://www.nusl.cz/ntk/nusl-49609.

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The thesis deals with the issue of operative dosimetry, to be specific, with personal dosimetry. The objective of the thesis is to compare several parameters, such as the dose, direction and energy dependence, in two types of electronic dosimeters made by the firm Siemens (type EPD1) and by the firm MGP Instruments (type DMC 2000XB). In the first section of my thesis the personal monitoring and related data such as quantities used to monitor external irradiation are introduced. In the next section the operative monitoring, focused mainly on electronic but also on thermoluminescent and radiophotoluminescent dosimetry, is described. The results of the irradiation (exposure) of electronic personal dosimeters of types EPD1 and DMC 2000XB are included in the thesis and the measured values are statistically processed. The dose, direction and energy dependence of both types of these dosimeters is evaluated and put into diagrams.

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Books on the topic "Thermoluminescent dosimetric system"

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Green, Stuart, Robert G. Zamenhof, and Denise E. Delahunty. Radiation measurement. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199655212.003.0004.

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The ability to make accurate and reproducible measurements requires a detailed knowledge of radiation detection mechanisms, quantities to be measured, basic measurement techniques, and assessment of measurement uncertainties. The chapter begins with an overview of the operational dose quantities and the mechanisms by which measurements are traced to a suitable primary standard. This is followed by some tips on detector selection for both dose rate and contamination applications, before a more detailed description of the basic functional characteristics of gas detectors, scintillation detectors, and semiconductor detector. In each case, suggestions are made on typical areas of use, limitations of performance along with practical examples. Detector resolution issues are discussed for active detectors before a brief overview of passive detector systems including film (photographic and radiochromic) and thermoluminescent dosimetry. The chapter concludes with some common issues in practical measurement and describes the role and importance of the annual instrument test.

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Book chapters on the topic "Thermoluminescent dosimetric system"

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"ON THE SET UP OF A THERMOLUMINESCENT DOSIMETRIC SYSTEM." In Operational Thermoluminescence Dosimetry. WORLD SCIENTIFIC, 1998. http://dx.doi.org/10.1142/9789812816252_0004.

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"CONCLUDING REMARKS ON A TL SYSTEM." In Operational Thermoluminescence Dosimetry. WORLD SCIENTIFIC, 1998. http://dx.doi.org/10.1142/9789812816252_0009.

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Reports on the topic "Thermoluminescent dosimetric system"

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Baumgartner, W. V., A. W. Endres, and S. R. Reese. Quality control program for the Hanford External Dosimetry thermoluminescent processing system. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7262866.

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Baumgartner, W. V., A. W. Endres, and S. R. Reese. Quality control program for the Hanford External Dosimetry thermoluminescent processing system. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10177764.

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Durrer, Jr., Russell Edward. An evaluation of the Panasonic model UD513AC-1 Thermoluminescence Dosimetry system. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/10188840.

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Liu, Chwei-jeng, C. Sims, and T. Rhea. Optimization of the readout procedures for the Harshaw 8800 TL (thermoluminescent) dosimetry system. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5873285.

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Herminghuysen, Kevin Ryan. Development and evaluation of a neutron-gamma mixed-field dosimetry system based on a single thermoluminescence dosimeter. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10188779.

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Sonder, E., and A. B. Ahmed. Background radiation accumulation and lower limit of detection in thermoluminescent beta-gamma dosimeters used by the centralized external dosimetry system. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/10109602.

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Sonder, E., and A. B. Ahmed. Background radiation accumulation and lower limit of detection in thermoluminescent beta-gamma dosimeters used by the centralized external dosimetry system. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5948905.

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