A study of the non-uniformity of the PMT photocathode response and its influence on the results obtained in different scintillation counting experiments
| العنوان: | A study of the non-uniformity of the PMT photocathode response and its influence on the results obtained in different scintillation counting experiments |
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| المؤلفون: | V. Todorov, P. Cassette, Ch. Dutsov, B. Sabot, S. Georgiev, K. Mitev |
| المساهمون: | Sofia University 'St. Kliment Ohridski', Paul Scherrer Institute (PSI), Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), the Bulgarian National Scientific Research Fund under contract KP-06-H38/9 from 06.12.19 (TDCX), This work is supported by the Bulgarian National Scientific Research Fund under contract KP-06-H38/9 from 06.12.19 (TDCX) |
| المصدر: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2023, 1046, pp.167719. ⟨10.1016/j.nima.2022.167719⟩ NDIP20-9Th Conference on new developments in photodetection NDIP20-9Th Conference on new developments in photodetection, Jul 2022, Troyes, France. pp.00371R1 |
| بيانات النشر: | HAL CCSD, 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | instrumentation, Nuclear and High Energy Physics, scintillation, Triple to Double coincidence Ratio (TDCR), Pulse-shape discrimination, photocathode, Primary activity measurement, non-uniformity, Radon measurements, spectrum analysis, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Metrology, counting efficiency, alpha-rays, spectrum, Plastic scintillation, spectrometry, radioactivity, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Energy resolution, Triple to Double Coincidence Ratio, ionizing radiation, Photocathode response spatial non-uniformity, nuclear instrumentation |
| الوصف: | International audience; We investigated the non-uniformity of the response of the photocathodes of some PMTs and their potential influence on the results of scintillation measurements. We have developed an experimental system which allows us to study the non-uniformity of the photocathode response and its influence on the shape of alpha spectra obtained after pulse-shape discrimination. The system is presented together with the first tests of a Hamamatsu R7600U-200 PMT. A degradation of the counting efficiency and a shift of the peak position towards small values was identified in the measurements near the edges of the photocathode where the energy resolution is significantly worse than the energy resolution at the central region of the PMT. Such non-uniformity also affects absolute activity measurements based on the free parameter model, i.e., the Triple to Double coincidence Ratio (TDCR) method and the CIEMAT/NIST efficiency tracing method. The traditional free parameter model assumes a Poisson distribution of the number of emitted photons but the non-uniformity leads to a compound Poisson distribution, where the mean value of the distribution is a random variable. This introduces an extra variance of the calculated detection efficiency which should be taken into account in the measurement uncertainty budget. Experimental results are presented in the paper, together with their practical influence in scintillation measurements and absolute calibration of radionuclides. |
| اللغة: | English |
| تدمد: | 0168-9002 1872-9576 |
| DOI: | 10.1016/j.nima.2022.167719⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3619e086ea8a90aa1e033ff30eff3255 https://cea.hal.science/cea-03910958/document |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....3619e086ea8a90aa1e033ff30eff3255 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 01689002 18729576 |
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| DOI: | 10.1016/j.nima.2022.167719⟩ |