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Ji, Y.-Y.*; Ochi, Kotaro; Hong, S. B.*; Nakama, Shigeo; Sanada, Yukihisa; Mikami, Satoshi
Health Physics, 121(6), p.613 - 620, 2021/12
Times Cited Count：1 Percentile：0.01(Environmental Sciences)According to the implementing arrangement between JAEA (Japan Atomic Energy Agency) and KAERI (Korea Atomic Energy Research Institute) in the field of the radiation protection and environmental radiation monitoring, the joint measurement has been conducted to assess the radioactive cesium deposition in the ground around the Fukushima Daiichi Nuclear Power Plants (FDNPP). First, mobile gamma-ray spectrometry using backpack survey platform was conducted to assess the distribution of dose rate around specific three survey sites. The carborne survey using gamma-ray spectrometers, as loading inside a vehicle, was successfully conducted to compare measured dose rates in routes from site to site and verify evaluation methods including the attenuation correction.
Ochi, Kotaro; Mori, Airi; Sasaki, Miyuki; Nakama, Shigeo; Mikami, Satoshi; Sanada, Yukihisa
no journal, ,
After the accident at TEPCO's Fukushima Daiichi Nuclear Power Station (FDNPS), the Japan Atomic Energy Agency (JAEA) has been conducting joint environmental radiation monitoring with foreign research institutes and ministries that have nuclear power plants. JAEA and KAERI have conducted joint walking and carborne surveys in the vicinity of FDNPS in 2018, 2019, and 2022. The results of the surveys confirmed that the mean and median of the relative deviations of the air dose rates measured by KAERI to those measured by JAEA were close to zero for both methods, indicating that the air dose rates of the two institutions were in good agreement. Factors contributing to the uncertainty in air dose rates include the accuracy of the horizontal positioning information of the GPS units of the two institutions and the difference in the interval of data acquisition. By comparing air dose rates obtained from different measurement devices in each country, we were able to confirm the characteristics and validity of air dose rate measurement methods in each country.
