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Development of the Environmental Radiation Survey Program and Its Application to In Situ Gamma-Ray Spectrometry

Ji, Young-Yong; Jang, Mee; Lee, Wanno1

doi: 10.1097/HP.0000000000001043
OPERATIONAL TOPIC
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An environmental radiation survey using a gamma-ray spectrometer is used to rapidly detect radioactive contamination over a wide area of ground that was released from nuclear events. For the successful application of a gamma-ray spectrometer to the calculation of the radioactivity concentration in the ground and the dose rate at 1 m above the ground, it is necessary to build a calibration procedure to obtain the counting efficiency at the in situ measurement, which means in situ calibration factor to report the calculation results from the measured net count rate according to the diverse detection geometries. This study is focused on the development of a program to calculate the in situ calibration factor and report the survey results in the environmental radiation surveys using three kinds of gamma-ray spectrometers, which have been widely used in the field of in situ measurements: a coaxial HPGe detector, cylindrical NaI(Tl), and rectangular NaI(Tl). The program is based on the results of diverse theoretical calculations of the unscattered photon fluence at the detector height, detector responses of three detectors, and their angular corrections. The developed program was successfully applied to the estimation of the radioactivity concentration of nuclides in the ground and the dose rate at 1 m height above the ground induced from them.

1Environmental Radioactivity Assessment Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.

The authors declare no conflicts of interest.

Young-Young Ji has been working as a principal researcher at Korea Atomic Energy Research Institute (KAERI) since 2004. He is in charge of the environmental radiation survey around nuclear facilities in the environmental radioactivity assessment team of KAERI. He has conducted the research project about the comprehensive environmental radiation survey in the environment using a backpack, carborne, airborne, and underwater survey system. He is interested in the development of the survey technology and algorithm to assess the ground deposition of radionuclides in the ground using diverse survey platforms. His email address is yyji@kaeri.re.kr.

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