Organic scintillator-based alpha/beta detector for radiological decontamination

Morishita, Yuki ; Di Fulvio, A.*; Clarke, S. D.*; Kearfott, K. J.*; Pozzi, S. A.*

We developed a prototype alpha/beta particle detector using a pulse shape discrimination (PSD) capable organic scintillator, a silicon photomultiplier, and a waveform digitizer. The charge integration PSD technique was used to separate alpha and beta particles. We compared the PSD figure of merit (FOM) values of two scintillators (EJ-299-33 and stilbene), and found that the stilbene (FOM =1.61) performance was superior to the EJ-299-33 (FOM = 0.56) performance, measured using an $^{241}$ Am source (5.5 MeV alpha particle emission) and a $^{90}$ Sr source. Additionally, the stilbene showed good energy resolution (23.6% FWHM for 5.5 MeV alpha particles). In the pulse height spectrum for the $^{90}$ Sr/ $^{90}$ Y source, the lower energy portion ( $^{90}$ Sr) and the higher energy portion ( $^{90}$ Y) could be separated.

Language	:	English
Journal	:	Nuclear Instruments and Methods in Physics Research A
Volume	:	935
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Pages	:	p.207 - 213
Publication Year/Month	:	2019/08
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Paper URL	:	https://doi.org/10.1016/j.nima.2019.04.024
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Keywords	:	福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
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Registration No. : AA20180605
JAEA Abstracts No. : 48001064
Paper Submission No. : 23321

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