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Report No.
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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.

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