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Simulation of Counting Efficiencies of Portable NaI Detector for Rapid Screening of Internal Exposure in Radiation Emergencies

방사선비상시 내부피폭 신속 분류를 위한 휴대용 NaI 검출기의 계측효율 전산모사

  • Ha, Wi-Ho (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Yoo, Jaeryong (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Yoon, Seokwon (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Pak, Min Jung (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Kim, Jong Kyoung (Department of Nuclear Engineering, Hanyang University)
  • 하위호 (한국원자력의학원 국가방사선비상진료센터) ;
  • 유재룡 (한국원자력의학원 국가방사선비상진료센터) ;
  • 윤석원 (한국원자력의학원 국가방사선비상진료센터) ;
  • 박민정 (한국원자력의학원 국가방사선비상진료센터) ;
  • 김종경 (한양대학교 원자력공학과)
  • Received : 2015.08.28
  • Accepted : 2015.11.16
  • Published : 2015.12.31

Abstract

In case of radiation emergencies, radioactive materials released into environments can cause internal exposure of members of the public. Even though whole body counters are widely used for direct measurement of internally deposited radionuclides, those are not likely to be used at the field to rapidly screen internal exposure. In this study, we estimated the counting efficiencies of portable NaI detector for different size BOMAB phantoms using Monte Carlo transport code to apply handheld gamma spectrometers for rapid screening of internal exposure following radiological accidents. As a result of comparison for two counting geometries, counting efficiencies for sitting model were about 1.1 times higher than those for standing model. We found, however, that differences of counting efficiencies according to different size are higher than those according to counting geometry. Therefore, we concluded that when we assess internal exposure of small size people compared to the reference male, the body size should be considered to estimate more accurate radioactivity in the human body because counting efficiencies of 4-year old BOMAB phantom were about 2.4~3.1 times higher than those of reference male BOMAB phantom.

Acknowledgement

Supported by : 한국원자력의학원

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