npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2020; 70: 903-907

Published online October 30, 2020 https://doi.org/10.3938/NPSM.70.903

Copyright © New Physics: Sae Mulli.

Development of a Depth Measurement with Two Types of Scintillators

Cheol-Ha BAEK1, Seung-Jae LEE2*

1Department of Radiological Science, Kangwon National University, Samcheok 25949, Korea

2Department of Radiological Science, Dongseo University, Busan 47011, Korea

Correspondence to:sjlee@gdsu.dongseo.ac.kr

Received: August 11, 2020; Revised: August 17, 2020; Accepted: August 17, 2020

Abstract

We have developed a detector that uses two types of scintillators and s photo sensor to measure the depth of interaction. A different type of scintillator was used for each layer, and light generated by interacting with the scintillator was collected using a photo sensor. The energy spectrum of the designed detector was obtained using a DETECT2000 simulation, and the performance of the designed detector was verified through preliminary experiments. As a scintillator, a lutetium oxyorthosilicate (LSO) or a Gadolinium Aluminium Gallium Garnet (GAGG) scintillator was used, and a silicon photomultiplier (SiPM) was used as the photo sensor. In the simulation, the scintillator array was composed of two layers, and a light yield corresponding to gamma ray interactions was generated in each scintillator pixel to obtain a signal to measure the energy spectrum. In the preliminary experiment, the energy spectrum was measured using a single-pixel scintillator, and the result was the photoelectric peak of the GAGG scintillator in the high-energy channel and that of the LSO scintillator in the low-energy channel as in the simulation. Because different photoelectric peaks are formed in the energy spectrum, the positions where the gamma rays and the scintillator interact can be measured, thereby improving the spatial resolution through measurement of the interaction depth.

Keywords: Two types of scintillator, Energy spectrum, SiPM, Depth of interaction, DETECT2000

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