Cross-Talk Characterization in Passive Neutron Coincidence Counting of Radioactive Waste Drums With Plastic Scintillators
| Autor: | Sebastien Colas, Bertrand Perot, Johann Collot, Cedric Carasco, B. Simony, Nicolas Saurel, Clement Deyglun |
|---|---|
| Přispěvatelé: | CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Direction des Applications Militaires (DAM), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics Monte Carlo method Detector Gamma ray chemistry.chemical_element Scintillator 01 natural sciences Neutron temperature Plutonium Nuclear physics Nuclear Energy and Engineering chemistry 0103 physical sciences Neutron Coincidence counting [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] Electrical and Electronic Engineering |
| Zdroj: | IEEE Trans.Nucl.Sci. IEEE Trans.Nucl.Sci., 2016, 63 (3), pp.1513-1519. ⟨10.1109/TNS.2016.2542290⟩ IEEE Transactions on Nuclear Science IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2016, 63 (3), pp.1513-1519. ⟨10.1109/TNS.2016.2542290⟩ IEEE Transactions on Nuclear Science, 2016, 63 (3), pp.1513-1519. ⟨10.1109/TNS.2016.2542290⟩ |
| ISSN: | 0018-9499 |
| Popis: | This paper reports on a numerical feasibility study of a passive neutron coincidence counting system for radioactive waste drums with plastic scintillators. The motivation is to replace $^{3}\text{He}$ gas counters generally used for this type of measurement. Indeed, plastic scintillators present several advantages for the measurement of neutron coincidences such as a good efficiency for detecting fast neutrons, short detection time, and low cost comparatively to $^{3}\text{He}$ . However, unlike $^{3}\text{He}$ counters, their high sensitivity to gamma rays and cross talk constitutes a drawback as parasite random and true coincidences are detected together with the useful signal of plutonium. Simulations are performed using the Monte Carlo transport code MCNPX-PoliMi v2.0 coupled to data processing algorithms developed with ROOT data analysis software. Performances of the coincidence counting system are studied for the case of a vitrified waste drum containing Pu and $^{241}\text{Am}$ , focusing particularly on multiplicity 1 and 2, i.e., 2 or 3 pulses recorded in a short time gate in different detectors. Cross talk induced by neutrons and gamma rays has been characterized in terms of time and distance between detectors, and strategies to limit this phenomenon are reported, consisting of ignoring neighboring detectors signal. A significant improvement of the Pu to $^{241}\text{Am}$ ratio for multiplicity 2 coincidences has thus been obtained, at the expense of counting statistics. Alternative case studies with organic and metallic matrixes of technological wastes are also reported, for which the part of useful signal of plutonium is significantly higher, showing the feasibility of the measurement method. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|