Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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An Analysis of Exposure Dose on Hands of Radiation Workers using a Monte Carlo Simulation in Nuclear Medicine

몬테카를로 모의 모사를 이용한 핵의학과 방사선작업종사자의 손에 대한 피폭선량 분석

  • Jang, Dong-Gun (Dept. of Nuclear Medicine, Dongnam Institute of Radiological & Medical Sciences Cancer Center) ;
  • Kang, Sesik (Dept. of Radiological Science, College of Health Sciences, Catholic University of Pusan) ;
  • Kim, Junghoon (Dept. of Radiological Science, College of Health Sciences, Catholic University of Pusan) ;
  • Kim, Changsoo (Dept. of Radiological Science, College of Health Sciences, Catholic University of Pusan)
  • 장동근 (동남권 원자력의학원 핵의학과) ;
  • 강세식 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 김정훈 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 김창수 (부산가톨릭대학교 보건과학대학 방사선학과)
  • Received : 2015.10.16
  • Accepted : 2015.12.08
  • Published : 2015.12.31
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Abstract

Workers in nuclear medicine have performed various tasks such as production, distribution, preparation and injection of radioisotope. This process could cause high radiation exposure to wokers' hand. The purpose of this study was to investigate shielding effect for r-rays of 140 and 511 keV by using Monte-carlo simulation. As a result, it was effective, regardless of lead thickness for radiation shielding in 140 keV r-ray. However, it was effective in shielding material with thickness of more than only 1.1 mm in 511keV r-ray. And also it doesn't effective in less than 1.1 mm due to secondary scatter ray and exposure dose was rather increased. Consequently, energy of radionuclide and thickness of shielding materials should be considered to reduce radiation exposure.

핵의학과에 근무하는 방사선작업종사자들은 방사성동위원소의 생산, 분배, 조제, 주입 등의 업무를 진행하며, 이러한 과정에서 손에 대한 방사선 피폭이 높게 발생한다. 이에 본 연구에서는 핵의학과에서 이용되는 방사성동위원소의 에너지로서 140 keV와 511 keV의 ${\gamma}$선에 대한 차폐효과를 몬테카를로 모의 모사를 통해 분석하였다. 모의실험 결과 140 keV ${\gamma}$선은 차폐체에 두께와 상관없이 모두 방사선에 대한 차폐효과가 발생되었으며, 511 keV의 ${\gamma}$선에서는 1.1 mm 이상에서 차폐효과가 발생되었다. 그러나 1.1 mm 미만에서는 2차적으로 발생된 산란선으로 인하여 차폐효과가 없었으며, 오히려 방사성동위원소의 피폭선량이 증가되었다. 따라서 효율적인 방사선 방어를 위해서는 핵종별 에너지에 따른 납 차폐체의 두께를 고려하여야 할 것이다.

Keywords

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