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Journal articles on the topic 'Gamma-gamma coincidence'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Drescher, A., M. Yoho, and S. Landsberger. "Gamma–gamma coincidence in neutron activation analysis." Journal of Radioanalytical and Nuclear Chemistry 318, no. 1 (2018): 527–32. http://dx.doi.org/10.1007/s10967-018-6033-8.

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2

Luca, A., P. De Felice, and G. Tanase. "Low level gamma spectrometry by beta–gamma coincidence." Applied Radiation and Isotopes 53, no. 1-2 (2000): 221–24. http://dx.doi.org/10.1016/s0969-8043(00)00137-8.

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3

McGrath, C. A., P. E. Garrett, M. F. Villani, and S. W. Yates. "Gamma–gamma coincidence measurements following inelastic neutron scattering." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 421, no. 3 (1999): 458–63. http://dx.doi.org/10.1016/s0168-9002(98)01170-x.

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4

Dinh, Hien Sy. "EXPERIMENTAL STUDY ON THE POSSIBILITY OF REDUCING BACKGROUND FOR THE GAMMA COINCIDENCE SPECTROMETER WITH HIGH PURE GERMANIUM DETECTORS." Science and Technology Development Journal 15, no. 2 (2012): 15–26. http://dx.doi.org/10.32508/stdj.v15i2.1797.

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Gamma coincidence spectrometers with HPGe detectors are used for environmental research, nuclear reactions (n, g), (n, 2g) due to Compton backgrounds of their gamma spectra are very low. In this work, three types of coincidence spectrometers such as gamma coincidence spectrometer, gamma coincidence spectrometers with TAC and sum coincidence spectrometer using HPGe are described. Some experimental results obtained by using gamma coincidence spectrometers are presented. Especially, taking advantages of the software and hardware of the sum coincidence spectrometer used for research of nuclear reactions (n, g), (n, 2g), we have converted the spectrometer to one with very low background level.

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5

Marković, Nikola, Per Roos, and Sven Poul Nielsen. "Digital gamma-gamma coincidence HPGe system for environmental analysis." Applied Radiation and Isotopes 126 (August 2017): 194–96. http://dx.doi.org/10.1016/j.apradiso.2016.12.017.

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6

Truong, Minh Van, Hung Minh Tran, Khang Dinh Pham, Hai Xuan Nguyen, Thang Huu Ho, and Anh Ngoc Nguyen. "Capability of gamma - gamma coincidence menthod to analyse arsenic and selenium." Science and Technology Development Journal 17, no. 2 (2014): 82–89. http://dx.doi.org/10.32508/stdj.v17i2.1317.

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The advantage of gamma – gamma coincidence method is abilities of background reduction. This technique has been studied and applications for neutron activation analysis. The experimental neutron activation analysis of geological samples, biological samples and environmental samples has been conducted by several some laboratories in the world. In this study, we would like to present the results of Arsenic and Selenium determination in geology sample by neutron activation analysis with technique of gamma – gamma coincidence measurement. By application of this gamma – gamma coincidence method, the influence isotopes as 182Ta, 181Hf, 152Eu were eliminated output from spectrometric measurement when analyzing 75Se and effects of overlap peaks from spectrometric measurement when analyzing arsenic.Thus improved detection limits for Arsenic and selenium in geological samples when analyzed by neutron activation analysis method.

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7

Yuan, Daqing, QiZhi Liu, Yuandi Yang, et al. "Digital Coincidence System for beta-gamma Coincidence Counting." Nuclear Physics A 834, no. 1-4 (2010): 773c—776c. http://dx.doi.org/10.1016/j.nuclphysa.2010.01.143.

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8

Vobecký, M., J. Jakůbek, C. Granja Bustamante, et al. "Multielement instrumental activation analysis based on gamma–gamma coincidence spectroscopy." Analytica Chimica Acta 386, no. 1-2 (1999): 181–89. http://dx.doi.org/10.1016/s0003-2670(99)00005-7.

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9

Jakůbek, J., P. Nuiten, J. Pluhař, et al. "Coincidence gamma–gamma spectroscopy system for instrumental neutron activation analysis." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 414, no. 2-3 (1998): 261–64. http://dx.doi.org/10.1016/s0168-9002(98)00497-5.

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10

Bikit, I., I. Aničin, and J. Slivka. "Optimum time for gamma-gamma coincidence measurements of decaying sources." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 269, no. 1 (1988): 329–32. http://dx.doi.org/10.1016/0168-9002(88)90897-2.

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11

Di Piero, A., M. A. Bacchi, and E. A. N. Fernandes. "INAA with gamma-gamma coincidence for selenium determination in food." Journal of Radioanalytical and Nuclear Chemistry 278, no. 3 (2008): 761–65. http://dx.doi.org/10.1007/s10967-008-1607-5.

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12

Nguyen, Ngoc Anh, Xuan Hai Nguyen, Dinh Khang Pham, and Huu Thang Ho. "First results in the study of level scheme for ¹⁷²Yb based on gamma-gamma coincidence spectrometer." Nuclear Science and Technology 6, no. 4 (2016): 26–31. http://dx.doi.org/10.53747/jnst.v6i4.173.

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Nuclear level scheme permits to determine nuclear level density, gamma strength function, and to evaluate nuclear models. In comparison to light nuclei, the structure of heavy nuclei is much more complicated because of their strong deformation. In order to study nuclear level scheme, gamma – gamma coincidence spectrometer with advantages of low Compton background and the ability of identifying correlated gamma transitionshas been often used. This paper presents the first results of an experimentalstudy of level scheme of 172Yb using gamma – gamma coincidence spectrometer at the Dalat Nuclear Research Institute.

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13

Truong, Minh Van, Khang Dinh Pham, Hai Xuan Nguyen, Son An Nguyen, and Chau Dac Nguyen. "Determination of the selenium content in biological samples by gamma - gamma coincidence method." Science and Technology Development Journal 19, no. 4 (2016): 154–61. http://dx.doi.org/10.32508/stdj.v19i4.607.

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At Dalat nuclear research reactor, the gamma - gamma coincidence method is eficiently used in data nuclear research direction. By this method, some laboratories in the world test neutron activation analysis of geological, biological and environmental samples. In this paper, we present the determination of the selenium content in biological sample by gamma – gamma coincidence method. The results showed that the compton scattering was suppressed. The ratio of peak counts/back was improved up to 64.2 times. The detection limit for selenium in biological sample was enhanced to 8.9 times to compare to the method one detector system.

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14

Paul, Asit Kr, Mitsuaki Tatsumi, and Tsunehiko Nishimura. "Gamma camera coincidence imaging in oncology." International Congress Series 1228 (February 2002): 117–27. http://dx.doi.org/10.1016/s0531-5131(01)00516-7.

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15

Ihantola, Sakari, Johan Sand, Kari Peräjärvi, Juha Toivonen, and Harri Toivonen. "Principles of UV–gamma coincidence spectrometry." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 690 (October 2012): 79–84. http://dx.doi.org/10.1016/j.nima.2012.06.044.

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16

Bikit, Istvan, Dusan Mrdja, Miroslav Veskovic, et al. "Coincidence Techniques in Gamma-ray Spectroscopy." Physics Procedia 31 (2012): 84–92. http://dx.doi.org/10.1016/j.phpro.2012.04.012.

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17

Sundgren, Orvar. "Coincidence summing correction in gamma spectrometry." Science of The Total Environment 130-131 (March 1993): 167–75. http://dx.doi.org/10.1016/0048-9697(93)90071-d.

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18

Semkow, Thomas M., Ghazala Mehmood, Pravin P. Parekh, and Mark Virgil. "Coincidence summing in gamma-ray spectroscopy." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 290, no. 2-3 (1990): 437–44. http://dx.doi.org/10.1016/0168-9002(90)90561-j.

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19

MIYAHARA, Hiroshi, Norihiko NARITA, Yoshichika KATOH, et al. "Determination of Intake Radioactivity by ^|^gamma;(HPGe)-^|^gamma;(HPGe) Coincidence Measurement." Transactions of the Atomic Energy Society of Japan 2, no. 1 (2003): 9–13. http://dx.doi.org/10.3327/taesj2002.2.9.

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20

Bottau, V., L. Tondut, P. G. Allinei, et al. "Study of gamma-ray background noise for radioactive waste drum characterization with plastic scintillators." EPJ Web of Conferences 225 (2020): 05004. http://dx.doi.org/10.1051/epjconf/202022505004.

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In the framework of the radioactive waste drum characterization using neutron coincidence counting, the Nuclear Measurement Laboratory of CEA Cadarache is studying plastic scintillators as an alternative to ideal but costly 3He gas proportional counters. Plastic scintillators are at least 5 times cheaper for the same detection efficiency, and in addition, they detect fast neutrons about three orders of magnitude faster than 3He detectors. However, they are sensitive to gamma rays, which implies the necessity to identify precisely gamma background sources that may affect the useful signal. This paper presents a detailed analysis of the gamma-ray spectrum of a radioactive waste drum containing glove box filters contaminated by plutonium dioxide. Gamma emissions accompanying inelastic scattering (n,n’) and (α,n) reactions that can lead to neutron-gamma coincidences parasitizing useful coincidences from plutonium spontaneous fissions are identified. Some of these parasitic gamma rays having energies up to several MeV, we plan to reject high-energy scintillator pulses with an electronics rejection threshold above 1 MeV, which should preserve the major part of useful fission neutron pulses.

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21

Konki, J., P. T. Greenlees, U. Jakobsson, et al. "Comparison of gamma-ray coincidence and low-background gamma-ray singles spectrometry." Applied Radiation and Isotopes 70, no. 2 (2012): 392–96. http://dx.doi.org/10.1016/j.apradiso.2011.10.004.

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22

Paradis, H., A. de Vismes Ott, X. Cagnat, F. Piquemal, and R. Gurriaran. "Leda: A gamma-gamma coincidence spectrometer for the measurement of environment samples." Applied Radiation and Isotopes 126 (August 2017): 179–84. http://dx.doi.org/10.1016/j.apradiso.2016.12.049.

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23

Nguyen, Son An. "Determination of the electric dipole (E1) gamma ray strength function of 56Mn from the Bn level to low levels by two-step gamma cascades." Science and Technology Development Journal 19, no. 1 (2016): 83–93. http://dx.doi.org/10.32508/stdj.v19i1.547.

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Investigation of gamma ray strength function is necessary to determine some nuclear characteristics, such as: spin, parity, electromagnetic transitions, cross section, … In this research, 55Mn target was activated on the neutron of 3rd horizontal channel of Dalat nuclear reactor. The experimental data was collected by event-event coincidence by gammagamma coincidence system. The 56Mn deexcitation afforded the collected of 49 gamma – gamma twostep cascades. This was applied on shell model to determine the spin, parity, electric dipole gamma strength function (E1) as well as comparing between the theoretical and experimental E1 transition probabilities

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24

Laymon, C. M., T. G. Turkington, and R. E. Coleman. "Attenuation effects in gamma-camera coincidence imaging." IEEE Transactions on Nuclear Science 45, no. 6 (1998): 3115–21. http://dx.doi.org/10.1109/23.737673.

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25

Grigorescu, E. L. "Low level gamma-spectrometry by beta coincidence." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 369, no. 2-3 (1996): 574–77. http://dx.doi.org/10.1016/s0168-9002(96)80054-4.

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26

Bouchard, J. ""IMPECC" a NEW 4πbeta/gamma coincidence system". IEEE Transactions on Nuclear Science 41, № 4 (1994): 957–59. http://dx.doi.org/10.1109/23.322838.

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27

MIYAHARA, Hiroshi, Norihiko NARITA, Yoshichika KATOH, et al. "Application of .GAMMA.-.GAMMA. Coincidence Measurement to Human Counter Using Ge Detectors. (1)." RADIOISOTOPES 50, no. 5 (2001): 155–62. http://dx.doi.org/10.3769/radioisotopes.50.155.

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28

Metwally, W. A., R. P. Gardner, and A. Sood. "Using gamma–gamma coincidence measurements to validate Monte Carlo generated detector response functions." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 263, no. 1 (2007): 50–53. http://dx.doi.org/10.1016/j.nimb.2007.04.137.

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29

Tittonen, Ilkka, Mikk Lippmaa, Panu Helistö, and Toivo Katila. "Stepwise phase modulation of recoilless gamma radiation in a coincidence experiment: Gamma echo." Physical Review B 47, no. 13 (1993): 7840–46. http://dx.doi.org/10.1103/physrevb.47.7840.

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30

Khang, Pham Dinh, N. X. Hai, V. H. Tan, and N. N. Dien. "Gamma–gamma coincidence spectrometer setup for neutron activation analysis and nuclear structure studies." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 634, no. 1 (2011): 47–51. http://dx.doi.org/10.1016/j.nima.2011.01.025.

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31

Zhang, Weihua, Jing Yi, Pawel Mekarski, Kurt Ungar, Barry Hauck, and Gary H. Kramer. "A gamma–gamma coincidence spectrometric method for rapid characterization of uranium isotopic fingerprints." Journal of Radioanalytical and Nuclear Chemistry 288, no. 1 (2010): 43–47. http://dx.doi.org/10.1007/s10967-010-0868-y.

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32

Chand, Bakhshish, Jatinder Goswamy, Devinder Mehta, Nirmal Singh, and P. N. Trehan. "Conversion-electron and gamma–gamma directional correlation measurements in 134Ba." Canadian Journal of Physics 68, no. 12 (1990): 1479–85. http://dx.doi.org/10.1139/p90-213.

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Conversion electrons from the decay of 134Cs have been investigated using a mini-orange electron spectrometer. The electron intensities for the K-conversion of 242.7 keV and L, (M + N … ) conversion of 563.2, 795.9, 801.9, 1038.6, 1167.9, and 1365.2 keV transitions in 134Ba are being reported for the first time. The conversion-electron data have been further used to determine the conversion coefficients for various transitions in, 34Ba. Also, the gamma–gamma directional correlation measurements for seven cascades in 134Ba have been carried out using a HPGe–HPGe detector coincidence setup. The multipole admixtures for the 475.3, 563.2, 569.3, 795.9, 801.9, 1038.6, and 1365.2 keV transitions have been deduced from these measurements. A multipole admixture of M1 + 37% E2 has been obtained for the 1038.6 keV transition in 134Ba. The reduced transition probability ratios for the transitions de-exciting second 2+ and 3+ energy levels in 134Ba have been calculated and compared with the values predicted by the triaxial rotor model for γ = 28.5°. This indicates the softness of the, 134Ba nucleus toward γ deformation.

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33

Metwally, Walid A., Robin P. Gardner, and Charles W. Mayo. "Elemental PGNAA analysis using gamma–gamma coincidence counting with the library least-squares approach." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 213 (January 2004): 394–99. http://dx.doi.org/10.1016/s0168-583x(03)01660-4.

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34

Horne, S., and S. Landsberger. "Selenium and mercury determination in biological samples using gamma–gamma coincidence and Compton suppression." Journal of Radioanalytical and Nuclear Chemistry 291, no. 1 (2011): 49–53. http://dx.doi.org/10.1007/s10967-011-1268-7.

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35

Susin, Eduarda, and Alain Destexhe. "Integration, coincidence detection and resonance in networks of spiking neurons expressing Gamma oscillations and asynchronous states." PLOS Computational Biology 17, no. 9 (2021): e1009416. http://dx.doi.org/10.1371/journal.pcbi.1009416.

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Gamma oscillations are widely seen in the awake and sleeping cerebral cortex, but the exact role of these oscillations is still debated. Here, we used biophysical models to examine how Gamma oscillations may participate to the processing of afferent stimuli. We constructed conductance-based network models of Gamma oscillations, based on different cell types found in cerebral cortex. The models were adjusted to extracellular unit recordings in humans, where Gamma oscillations always coexist with the asynchronous firing mode. We considered three different mechanisms to generate Gamma, first a mechanism based on the interaction between pyramidal neurons and interneurons (PING), second a mechanism in which Gamma is generated by interneuron networks (ING) and third, a mechanism which relies on Gamma oscillations generated by pacemaker chattering neurons (CHING). We find that all three mechanisms generate features consistent with human recordings, but that the ING mechanism is most consistent with the firing rate change inside Gamma bursts seen in the human data. We next evaluated the responsiveness and resonant properties of these networks, contrasting Gamma oscillations with the asynchronous mode. We find that for both slowly-varying stimuli and precisely-timed stimuli, the responsiveness is generally lower during Gamma compared to asynchronous states, while resonant properties are similar around the Gamma band. We could not find conditions where Gamma oscillations were more responsive. We therefore predict that asynchronous states provide the highest responsiveness to external stimuli, while Gamma oscillations tend to overall diminish responsiveness.

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36

Britton, R., J. L. Burnett, A. V. Davies, and P. H. Regan. "Coincidence corrections for a multi-detector gamma spectrometer." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 769 (January 2015): 20–25. http://dx.doi.org/10.1016/j.nima.2014.09.054.

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37

Rudolph, D. "High-resolution in-beam particle-gamma coincidence spectroscopy." European Physical Journal A 20, no. 1 (2003): 37–38. http://dx.doi.org/10.1140/epja/i2002-10317-0.

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38

Zahn, Guilherme Soares, Frederico Antonio Genezini, Cibele Bugno Zamboni, and Manoel Tiago Freitas da Cruz. "Gamma transition intensity determination using multidetector coincidence data." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 605, no. 3 (2009): 339–43. http://dx.doi.org/10.1016/j.nima.2009.04.001.

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39

Ely, J. H., C. E. Aalseth, and J. I. McIntyre. "Novel beta-gamma coincidence measurements using phoswich detectors." Journal of Radioanalytical and Nuclear Chemistry 263, no. 1 (2005): 245–50. http://dx.doi.org/10.1007/s10967-005-0044-y.

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40

Korun, M., and R. Martinčič. "Coincidence summing in gamma and X-ray spectrometry." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 325, no. 3 (1993): 478–84. http://dx.doi.org/10.1016/0168-9002(93)90394-w.

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41

Sýkora, I., M. Ješkovský, R. Janik, K. Holý, M. Chudý, and P. P. Povinec. "Low-level single and coincidence gamma-ray spectrometry." Journal of Radioanalytical and Nuclear Chemistry 276, no. 3 (2008): 779–87. http://dx.doi.org/10.1007/s10967-008-0632-8.

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42

SOLOMYAK, RITA. "On coincidence of entropies for two classes of dynamical systems." Ergodic Theory and Dynamical Systems 18, no. 3 (1998): 731–38. http://dx.doi.org/10.1017/s0143385798108313.

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Let $ \Gamma $ be a periodic graph with the vertex set ${\Bbb Z}^d $. A subgraph of $ \Gamma $ is called an essential spanning forest if it contains all vertices of $ \Gamma $, has no cycles, and if all its connected components are infinite. The set of all essential spanning forests in $ \Gamma $ is compact in a suitable topology, and ${\Bbb Z}^d $ acts on it by translations. Burton and Pemantle computed the topological entropy of such an action. Their formula turned out to be the same as the formula for the topological entropy of ${\Bbb Z}^d $-actions on certain subgroups of $({\Bbb R}/{\Bbb Z})^{{\Bbb Z}^d}$ obtained previously by Lind, Schmidt and Ward. The question was to explain the coincidence. Here we prove directly that the entropies for two systems must be equal.

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43

Stanescu, Razvan, Hadrick Green, Toby Morris, Gencho Rusev, and Marian Jandel. "Prompt Fission Gamma-Ray Measurements at UML Research Reactor." EPJ Web of Conferences 242 (2020): 01009. http://dx.doi.org/10.1051/epjconf/202024201009.

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Neutron-induced fission of 235U was studied at the thermal column of the UMass Lowell 1 MW Research Reactor. A collimated, 2.25-inch diameter beam of thermal neutrons with the flux of ~5x105 n/cm2/sec induced fission reaction on a plate of low-enriched uranium with the areal density ~25 mg/cm2 of 235U. We have used the prompt fission-neutron tagging method to identify the fission reaction in the off-line analysis. The method employs the pulse-shape discrimination of neutrons and gamma-ray events in stilbene scintillator and enables identification of coincidence events of prompt fission gamma-rays and prompt fission neutrons in coincidence time intervals less than 20-30 ns. The prompt gamma-ray radiation was detected using two co-linear NaI(Tl) detectors. The measured spectra of prompt-fission gamma rays between 150 keV and 6 MeV are presented. The results from these initial measurements demonstrate the feasibility of the experimental method. Future measurements with extended arrays of detectors are planned.

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44

INOSHITA, Shunya, and Shogo SUZUKI. "Investigation of Absolute Counting of Radioactivity by Gamma-gamma Coincidence Counting Method Using Ge Detectors." RADIOISOTOPES 57, no. 1 (2008): 53–58. http://dx.doi.org/10.3769/radioisotopes.57.53.

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45

Zhang, Weihua, Kurt Ungar, Matthew Stukel, and Pawel Mekarski. "A gamma–gamma coincidence/anticoincidence spectrometer for low-level cosmogenic 22Na/7Be activity ratio measurement." Journal of Environmental Radioactivity 130 (April 2014): 1–6. http://dx.doi.org/10.1016/j.jenvrad.2013.12.018.

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46

Hager, W. W., and K. S. Krane. "The angular correlation factor in gamma-ray coincidence summing." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 976 (October 2020): 164239. http://dx.doi.org/10.1016/j.nima.2020.164239.

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47

Karbach, H., H. Spiering, and P. Gütlich. "Gamma-X-ray coincidence Mössbauer emission spectroscopy on57Co/CoO." Hyperfine Interactions 93, no. 1 (1994): 1579–83. http://dx.doi.org/10.1007/bf02072912.

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48

Novković, Dušan, Mirjana Đurašević, Aleksandar Kandić, Ivana Vukanac, Zoran Milošević, and Laslo Nađđerđ. "Coincidence summing of X- and gamma rays of 133Ba." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 582, no. 2 (2007): 592–602. http://dx.doi.org/10.1016/j.nima.2007.09.010.

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49

McIntyre, Justin I., Brian T. Schrom, Mathew W. Cooper, et al. "LaCl3:Ce coincidence signatures to calibrate gamma-ray detectors." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 652, no. 1 (2011): 201–4. http://dx.doi.org/10.1016/j.nima.2011.02.072.

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50

Abdel-Dayem, H. "Clinical Experience with Dual Head Gamma Camera Coincidence Imaging." Clinical Positron Imaging 2, no. 1 (1999): 31–39. http://dx.doi.org/10.1016/s1095-0397(99)00002-3.

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