Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Second intercomparison on electron paramagnetic resonance (EPR) retrospective dosimetry in Korea using hydroxyapatite

  • HyoJin Kim (Dongnam Institute of Radiological & Medical Sciences) ;
  • Jae Seok Kim (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Byeong Ryong Park (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Seongjae Jang (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Han-Ki Jang (Korean Association for Radiation Application) ;
  • Ki-Taek Han (Korean Association for Radiation Application) ;
  • Hoon Choi (Radiation Health Institute, Korea Hydro and Nuclear Power Co., Ltd.) ;
  • Jeongin Kim (Radiation Health Institute, Korea Hydro and Nuclear Power Co., Ltd.) ;
  • In Jung Kim (Korea Research Institute of Standards and Science) ;
  • Yunho Kim (Korea Research Institute of Standards and Science) ;
  • Wi-Ho Ha (Korea Atomic Energy Research Institute) ;
  • Jungil Lee (Korea Atomic Energy Research Institute) ;
  • Yeong-Rok Kang (Dongnam Institute of Radiological & Medical Sciences)
  • Received : 2023.03.12
  • Accepted : 2023.08.16
  • Published : 2023.12.25
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Abstract

The Korea retrospective dosimetry (KREDOS)-electron paramagnetic resonance (EPR) group undertook an intercomparison investigation utilizing hydroxyapatite. This analysis involved four institutions: the Korea Institute of Radiological and Medical Sciences, Dongnam Institute of Radiological and Medical Sciences, Korean Association for Radiation Application, and Radiation Health Institute of Korea Hydro & Nuclear Power. Following the irradiation of the hydroxyapatite sample, the recorded build-up was analyzed. To validate the reliability of the EPR dosimetry findings and enhance its operational performance, a hydroxyapatite dose-response curve was plotted and dosimetry was performed for a blind sample. The proficiency of each laboratory was assessed by employing an interlaboratory comparison methodology. This involved a comparative analysis of the measurement results by calculating the relative bias, z-score, and En value. The results submitted by the participating laboratories demonstrated satisfactory ratings for doses of 1.006, 3.999, and 6.993 Gy. Following the second intercomparison, efforts to optimize their hydroxyapatite-EPR dosimetry systems are underway in the participating laboratories. The current assessment of hydroxyapatite dose yielded the foundational data required to establish the parameters of dental dosimetry. In future, the third intercomparison experiment will be conducted for exploring other materials.

Keywords

Acknowledgement

This work was supported by the Dongnam Institute of Radiological & Medical Sciences (DIRAMS) grant funded by the Korea government (MSIT) (No.50491-2023).

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