EPJ Web Conf.
Volume 253, 2021ANIMMA 2021 – Advancements in Nuclear Instrumentation Measurement Methods and their Applications
|Number of page(s)||5|
|Section||Nuclear Fuel Cycle, Safeguards and Homeland Security|
|Published online||19 November 2021|
Sorting fission from parasitic coincidences of neutrons and gamma rays in plastic scintillators using particle times of flight
CEA, DES, IRESNE, DTN, SMTA, Nuclear Measurement Laboratory, Cadarache, F-13108 Saint-Paul-Lez-Durance, France
b Université de Bordeaux, CNRS, CENBG, UMR 5797, F-33170 Gradignan, France
* Corresponding author: email@example.com
Published online: 19 November 2021
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.
Key words: Plastic PVT scintillators / spontaneous fission prompt neutrons and gamma rays / coincidence analysis / radioactive waste drums
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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