Development of Effective ${\gamma}$-ray and ${\beta}$-ray Detection Methods For Low-Level Radioactive Wastes

극저준위 방사성 폐기물을 위한 효율적인 ${\gamma}$-선 및 ${\beta}$-선 측정 방법 개발

  • Kwak, Sung-Woo (Korea Advanced Institute of Science and Technology) ;
  • Yeom, Yu-Sun (Korea Hydro and Nuclear rower Co., Ltd. Nuclear Environmental Technology Institute) ;
  • Kim, Ho-Kyung (Korea Advanced Institute of Science and Technology) ;
  • Cho, Gyu-Seong (Korea Advanced Institute of Science and Technology) ;
  • Park, Joo-Wan (Korea Hydro and Nuclear rower Co., Ltd. Nuclear Environmental Technology Institute) ;
  • Kim, Chang-Lak (Korea Hydro and Nuclear rower Co., Ltd. Nuclear Environmental Technology Institute) ;
  • Song, Myung-Jae (Korea Hydro and Nuclear rower Co., Ltd. Nuclear Environmental Technology Institute)
  • Published : 2001.12.30

Abstract

The non-combustible RI wastes disposed of in hospital every year emit ${\gamma}$-ray or ${\beta}$-ray but their activities are very low to the extent of background. Development of more simple methods is needed because the conventional detection methods are so ineffective and complex. In this study, to solve this problem, detection method using efficiency curve for ${\gamma}$-ray emitting radioactive wastes measurement is proposed and experimental detection efficiency equation is also determined through HPGe's standard specimen measurement. For ${\beta}$-emitting radioisotopes detection, new measurement method using detection efficiency estimated by Monte Carlo simulation and SBD measurements is also proposed. According to the results of this paper, the unknown activity of low-level radioactive wastes without LSC requiring the preparation of standard sample and measurement for standard source detection efficiency could be determined efficiently and simply about ${\pm}17%$ in errors by using the theoretical detection efficiency and the SBD measurement result.