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Lee, Jung, and Lee: Research of Efficiency for Gas Electron Multiplier Detector to Monitor Low Energy Gamma-Ray and Beta-Ray
Original Article

Progress in Medical Physics 2014;25(2):95-99.

Published online: 20 June 2014

DOI: https://doi.org/10.14316/pmp.2014.25.2.95

Research of Efficiency for Gas Electron Multiplier Detector to Monitor Low Energy Gamma-Ray and Beta-Ray

Soonhyouk Lee∗, Jae Hoon Jung∗, Rena Lee†,

∗Medical Research Institute, Ewha Womans University, Seoul, Korea

†Department of Radiation Oncology, School of Medicine, Ewha Womans University, Seoul, Korea

Correspondence: Rena Lee (renalee@ewha.ac.kr) Tel:82-2-2650-5337, Fax:82-2-2654-0363

This work was supported by the Nuclear Power Core Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 201315–10400050).

Received 29 April 2014       Revised 9 May 2014       Accepted 13 May 2014

Copyright © 2014 Korean Society of Medical Physics

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Radiation monitoring is one of the most important process in all places where radioactive material is used including hospital. In this preliminary study, we made GAS electron multiplier (GEM) detector and acquired relative efficiencies in order to see if GEM detector can be useful in radiation monitoring system. The relative efficiency was acquired by using the ratio of GEM detector efficiency to CdTe detector efficiency. The relative efficiency of 72% and 4% was acquired for beta-ray and gamma-ray respectively.

Keywords: GEM detector, Efficiency

References

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Fig. 1.
(a) GEM detector, (b) GEM detector system.
pmp-25-95f1.tif
Fig. 2.
GEM 검출기 내부 구조.
pmp-25-95f2.tif
Table 1.
Sr-90의 상대적 검출 효율.
CdTe∗ GEM
Count Background Net count Count Background Net count 상대적 검출효율
10,927±309 115±25 10,812±304 129,048±2,088 90±11 128,958±2,091 71.6±2.65

Sr-90의 평균적인 상대적 검출효율 71.6±2.65 (mean±s.d.)

∗ CdTe의 540 KeV영역의 검출효율 6%

Table 2.
Cs-137의 상대적 검출 효율.
CdTe∗ GEM
Count Background Net count Count Background Net count 상대적 검출효율
82,974±3,292 110±7 82,864±3,292 52,401±1,461 91±14 52,310±1,467 3.79±0.18

Cs-137의 평균적인 상대적 검출효율 3.79±0.18 (mean±s.d.)

∗ CdTe의 660 KeV영역의 검출효율 6%

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