Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
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Changes of Optically Stimulated Luminescence Dosimeter Sensitivity with High Dose

고선량에 대한 광자극발광선량계의 방사선 민감도 변화 연구

  • Han, Su Chul (Radiological & Medico-Oncological Sciences, University of Science and Technology) ;
  • Kim, Kum Bae (Radiological & Medico-Oncological Sciences, University of Science and Technology) ;
  • Choi, Sang Hyoun (Division of Medical Radiation Equipment, Korea Institute of Radiological and Medical Sciences) ;
  • Park, Seungwoo (Division of Medical Radiation Equipment, Korea Institute of Radiological and Medical Sciences) ;
  • Jung, Haijo (Radiological & Medico-Oncological Sciences, University of Science and Technology) ;
  • Ji, Young Hoon (Radiological & Medico-Oncological Sciences, University of Science and Technology)
  • 한수철 (과학기술연합대학원대학교 방사선종양의과학) ;
  • 김금배 (과학기술연합대학원대학교 방사선종양의과학) ;
  • 최상현 (한국원자력의학원 방사선기기부) ;
  • 박승우 (한국원자력의학원 방사선기기부) ;
  • 정해조 (과학기술연합대학원대학교 방사선종양의과학) ;
  • 지영훈 (과학기술연합대학원대학교 방사선종양의과학)
  • Received : 2016.06.10
  • Accepted : 2016.06.23
  • Published : 2016.06.30
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Abstract

We investigated the effect of high dose on the sensitivity of optically stimulated luminance dosimeters (OSLDs) on Co-60 gamma rays and used a commercial OLSD (Landauer, Inc., Glenwood, IL). New OSLDs were chosen arbitrarily and were irradiated with 1 Gy repeatedly. We confirmed the change in the radiation sensitivity after repeated irradiation. The OSLD sensitivity increased up to 3% after irradiating for seven times and decreased continuously after the eighth time. It dropped by approximately 0.35 Gy per irradiation. Finally, after irradiating for 30 times, the OSLD sensitivity decreased by approximately 7%. When the OSLDs were irradiated 10 times with 1 Gy after their irradiation using a high dose of 15 Gy and 30 Gy, their sensitivity decreased by 6% and 12%, respectively, compared to that before high-dose irradiation. The change in the OSLD sensitivity with a high dose could be modeled by an exponential equation. We confirmed the radiation sensitivity variation caused by a high dose, and the irradiation history of dosimeters was considered to reuse OSLDs irradiated with a high dose.

본 연구는 고선량으로 인한 광자극발광선량계의 방사선 민감도 변화에 관하여 분석하기 위하여 60-Co 감마선에서 상용화된 광자극발광선량계(Landauer, Inc., Glenwood, IL)를 이용하였다. 고선량으로 인한 방사선 민감도 변화를 분석하기 위하여 한번도 사용하지 않은 소자들을 이용하여 상대적 방사선 민감도 변화 경향을 확인하였으며, 7번째까지 3% 정도 증가하다가 그 이후 1 Gy의 조사 횟수에 따라 0.35%씩 감소하는 것을 확인하였다. 그리고 30회까지 조사하였을 때 7% 감소하였다. 고 선량을 받은 소자들의 경우, 15 Gy가 조사된 그룹은 한번도 사용하지 않은 소자들의 방사선 민감도에 비해 6% 감소하였으며, 30 Gy가 조사된 그룹은 12% 감소하였다. 감소되는 경향은 지수함수에 곡선 맞춤 하였다. 고선량을 받은 소자들을 다시 재 사용할 경우 측정에 대한 큰 불확도를 가지고 있으며, 이를 인지 하고 소자에 대한 조사 이력 관리를 하면서 사용해야 할 것이다.

Keywords

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