npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2020; 70: 575-581

Published online July 31, 2020

Copyright © New Physics: Sae Mulli.

Study of the Scintillation Properties of a CsI:Tl Crystal and Pulse Shape Discrimination Study

Sang Hyeok IM, HongJoo KIM*, Phan Quoc VUONG

Department of Physics, Kyungpook National University, Daegu 41566, Korea


Received: December 5, 2019; Revised: February 28, 2020; Accepted: February 28, 2020


Scintillators are widely used in and studied for particle physics, nuclear physics and astroparticle physics detection. In this study, we estimated the scintillation properties of a CsI:Tl crystal and determined the best method to discriminate $\alpha$-particles, which is an important component of the cosmic-ray background, from $\gamma$-rays. We studied the scintillation properties of the CsI:Tl crystal and the pulse shape discrimination capability by using an $^{241}$Am $\alpha$-particle source and a $^{137}$Cs $\gamma$-ray source. For the pulse shape discrimination study, we used these well-known methods: the mean time method, charge integration method and optimum filter method. To determine which method was best for discrimination, we calculated the FOM value for each method under various conditions. Consequently, the optimum filter method was found to give the best value of the FOM. If we use the optimum filter method when we are observing $\gamma$-rays from the sky, we can distinguish the background of ion particles, such as $\alpha$-particles, from $\gamma$-rays.

Keywords: Scintillator, Gamma-ray observation, Radiation detector, Radiation discrimination, Cosmic ray


Fig. 1. Several graphs for Optimum Filter Method. (a) Calculated FOM values for different window. (b) and (c) Graphs for SI -- energy and normalized counts -- SI graph, respectively. As same as previous methods, blue means $\gamma$-rays and red means $\alpha$-particles.

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