Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Measurement uncertainty analysis of radiophotoluminescent glass dosimeter reader system based on GD-352M for estimation of protection quantity

  • Kim, Jae Seok (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Park, Byeong Ryong (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) ;
  • Jang, Won Il (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) ;
  • Cho, Gyu Seok (Research Team of Radiological Physics & Engineering, Korea Institute of Radiological and Medical Sciences) ;
  • Kim, Hyun (Research Center, Dongnam Institute of Radiological and Medical Sciences) ;
  • Chang, Insu (Radiation Safety Management Division, Korea Atomic Energy Research Institute) ;
  • Kim, Yong Kyun (Department of Nuclear Engineering, University of Hanyang)
  • Received : 2021.03.09
  • Accepted : 2021.08.10
  • Published : 2022.02.25
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Abstract

At the Korea Institute of Radiological and Medical Sciences, physical human phantoms were developed to evaluate various radiation protection quantities, based on the mesh-type reference computational phantoms of the International Commission on Radiological Protection. The physical human phantoms were fabricated such that a radiophotoluminescent glass dosimeter (RPLGD) with a Tin filter, namely GD-352M, could be inserted into them. A Tin filter is used to eliminate the overestimated signals in low-energy photons below 100 keV. The measurement uncertainty of the RPLGD reader system based on GD-352M should be analyzed for obtaining reliable protection quantities before using it for practical applications. Generally, the measurement uncertainty of RPLGD systems without Tin filters is analyzed for quality assurance of radiotherapy units using a high-energy photon beam. However, in this study, the measurement uncertainty of GD-352M was analyzed for evaluating the protection quantities. The measurement uncertainty factors in the RPLGD include the reference irradiation, regression curve, reproducibility, uniformity, energy dependence, and angular dependence, as described by the International Organization for Standardization (ISO). These factors were calculated using the Guide to the Expression of Uncertainty in Measurement method, applying ISO/ASTM standards 51261(2013), 51707(2015), and SS-ISO 22127(2019). The measurement uncertainties of the RPLGD reader system with a coverage factor of k = 2 were calculated to be 9.26% from 0.005 to 1 Gy and 8.16% from 1 to 10 Gy. A blind test was conducted to validate the RPLGD reader system, which demonstrated that the readout doses included blind doses of 0.1, 1, 2, and 5 Gy. Overall, the En values were considered satisfactory.

Keywords

Acknowledgement

This study was supported by a grant of the Korea Institute of Radiological and Medical Sciences (KIRAMS), funded by Ministry of Science and ICT (MSIT), Republic of Korea (No. 74320209). This work was supported by the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KoFONS), granted financial resource support from the Nuclear Safety and Security Commission (NSSC), Republic of Korea (No. 1803014).

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