open access

https://hdl.handle.net/2115/60098

Feasibility study on signal separation for spontaneous alpha decay in LaBr3:Ce scintillator by signal peak-to-charge discrimination

英語

2015-08

American Institute of Physics (AIP)

Review of scientific instruments

86(8)

85108

A novel analysis method named peak-to-charge ratio (V-p/Q(total)) discrimination, aiming at background rejection especially for alpha decay self-activity in LaBr3:Ce scintillators has been developed. This method is based on a waveform analysis using the peak-to-charge ratio in the output waveform of a photomultiplier tube. The discrimination of alpha-induced events was achieved by using a threshold function based on the error propagation of the V-p/Q(total) value. The accidental rejection ratio of gamma-induced events was evaluated to be 0.17%. Furthermore, a total absorption peak spectrum processed with the V-p/Q(total) discrimination method for Ga-68 1.883 MeV gamma rays, where the energy was overlapped with background alpha events, reproduced exactly the same result as that of the background subtraction method. The difference in measured peak counts of both methods was 0.716%, and the statistical error in the V-p/Q(total) discrimination method and background subtraction was 4.81% and 8.70%, respectively. Thus a higher-accuracy measurement could be achieved using the V-p/Q(total) discrimination method. The present study demonstrates that the V-p/Q(total) discrimination method is a promising method for background rejection of the spontaneous alpha decay in LaBr3: Ce scintillators. (C) 2015 AIP Publishing LLC.

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Creative Commons Attribution 3.0 Unported

Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Review of scientific instruments and may be found at http://scitation.aip.org/content/aip/journal/rsi/86/8/10.1063/1.4928115.

0034-6748

AA00817730