Nuclear Engineering and Technology

  • 제52권10호
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  • Pages.2379-2386
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  • 2020
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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The first KREDOS-EPR intercomparison exercise using alanine pellet dosimeter in South Korea

  • Park, Byeong Ryong (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Kim, Jae Seok (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) ;
  • Ha, Wi-Ho (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Jang, Seongjae (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Kang, Yeong-Rok (Research Center, Dongnam Institute of Radiological and Medical Sciences) ;
  • Kim, HyoJin (Research Center, Dongnam Institute of Radiological and Medical Sciences) ;
  • Jang, Han-Ki (Radiation Technology & Research Center, Korean Association for Radiation Application) ;
  • Han, Ki-Tek (Radiation Technology & Research Center, Korean Association for Radiation Application) ;
  • Min, Jeho (Radiation Technology & Research Center, Korean Association for Radiation Application) ;
  • Choi, Hoon (Radiation Health Institute, Korea Hydro and Nuclear Power Co., Ltd.) ;
  • Kim, Jeongin (Radiation Health Institute, Korea Hydro and Nuclear Power Co., Ltd.) ;
  • Lee, Jungil (Radiation Safety Management Division, Korea Atomic Energy Research Institute) ;
  • Kim, Hyoungtaek (Radiation Safety Management Division, Korea Atomic Energy Research Institute) ;
  • Kim, Jang-Lyul (Radiation Safety Management Division, Korea Atomic Energy Research Institute)
  • 투고 : 2019.07.30
  • 심사 : 2020.03.25
  • 발행 : 2020.10.25
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초록

This paper presents the results of the first intercomparison exercise performed by the Korea retrospective dosimetry (KREDOS) working group using electron paramagnetic resonance (EPR) spectroscopy. The intercomparison employed the alanine dosimeter, which is commonly used as the standard dosimeter in EPR methods. Four laboratories participated in the dose assessment of blind samples, and one laboratory carried out irradiation of blind samples. Two types of alanine dosimeters (Bruker and Magnettech) with different geometries were used. Both dosimeters were blindly irradiated at three dose levels (0.60, 2.70, and 8.00 Gy) and four samples per dose were distributed to the participating laboratories. Assessments of blind doses by the laboratories were performed using their own measurement protocols. One laboratory did not participate in the measurements of Magnettech alanine dosimeter samples. Intercomparison results were analyzed by calculating the relative bias, En value, and z-score. The results reported by participating laboratories were overall satisfactory for doses of 2.70 and 8.00 Gy but were considerably overestimated with a relative bias range of 10-95% for 0.60 Gy, which is lower than the minimum detectable dose (MDD) of the alanine dosimeter. After the first intercomparison, participating laboratories are working to improve their alanine-EPR dosimetry systems through continuous meetings and are preparing a second intercomparison exercise for other materials.

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