Sorting fission from parasitic coincidences of neutrons and gamma rays in plastic scintillators using particle times of flight - Archive ouverte HAL
Communication Dans Un Congrès Année : 2021

Sorting fission from parasitic coincidences of neutrons and gamma rays in plastic scintillators using particle times of flight

V. Bottau
  • Fonction : Auteur
CEA Cadarache
C. Carasco
  • Fonction : Auteur
CEA Cadarache
B. Perot
  • Fonction : Auteur
CEA Cadarache
C. Eleon
  • Fonction : Auteur
CEA Cadarache
R. de Stefano
CEA Cadarache
L. Isnel
  • Fonction : Auteur
CEA Cadarache
I. Tsekhanovich
  • Fonction : Auteur
Centre d'Etudes Nucléaires de Bordeaux Gradignan

Résumé

This work addresses the use of plastic scintillators as an alternative to 3He detectors for radioactive waste drum characterization. The time response of scintillators is three orders of magnitude faster than that of gas proportional counters and they offer similar neutron detection efficiency at lower cost. However, they are sensitive to gamma rays and the commonly used Pulse Shape Discrimination technique is not possible with basic PVT scintillators. This paper reports on an innovative data processing technique allowing to extract spontaneous fission events from parasitic coincidences, such as those from the (α,n) reactions accompanied by correlated gamma rays or from pure gamma-ray sources emitting correlated radiations. The proposed approach makes advantage of differences in the pulse detection times recorded in measurements with the 252Cf, AmBe and 60Co sources. More precisely, a 2D histogram of time delays between the detected 2nd and 1st pulses, on the x-axis, and between the 3rd and 2nd pulses, on the y-axis, is found to allow for selection of a region of interest most relevant to spontaneous fission events.

Domaines

Physique Nucléaire Expérimentale [nucl-ex]

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https://hal.science/hal-03672619

Soumis le : jeudi 19 mai 2022-14:37:43

Dernière modification le : jeudi 11 avril 2024-13:18:11

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Dates et versions

hal-03672619 , version 1 (19-05-2022)

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Citer

V. Bottau, C. Carasco, B. Perot, C. Eleon, R. de Stefano, et al.. Sorting fission from parasitic coincidences of neutrons and gamma rays in plastic scintillators using particle times of flight. The 7th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, Jun 2021, Prague, Czech Republic. pp.07014, ⟨10.1051/epjconf/202125307014⟩. ⟨hal-03672619⟩

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