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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.
Takeishi, Minoru
JAEA-Review 2020-077, 388 Pages, 2021/05
JAEA-Review-2020-077.pdf:18.48MB
Japan Atomic Energy Agency (JAEA) have implemented environmental radiation monitoring since 1960s around different kinds of nuclear facilities such as research reactors, MOX fuel fabrication development facilities and the first spent fuel reprocessing facility for commercial NPPs and so on. I summarize the environmental monitoring methodology from planning to evaluation comprehensively as a guide book based on our experience and referring to the latest information. This guide book contained various basic knowledge about history of environmental radiation surveillances, techniques of radiation measurement and analysis of environmental samples such as airborne materials, precipitation, fallout, soil, sediment in river and lake, drinking water, terrestrial water, vegetables, milk, pasture, sea water, seabed sediment, marine product, index samples, and including with related to fundamental knowledges like an exposure evaluation for the public and quality assurance(QA), and some regulations. In particular, I include the emergency environmental radiation monitoring with response to the accident of Chernobyl Nuclear Power Plant and Tokyo Electric Power Company Fukushima Daiichi Nuclear Power Station. Finally, I note some topics on the environmental impact study that I have experienced.
Kowatari, Munehiko; Tanimura, Yoshihiko; Kessler, P.*; Neumaier, S.*; R
ttger, A.*
Radioisotopes, 70(1), p.1 - 18, 2021/01
scintillation detector coupled with lead shieldingKowatari, Munehiko; Tanimura, Yoshihiko
JPS Conference Proceedings (Internet), 24, p.011037_1 - 011037_7, 2019/01
Saegusa, Jun; Yanagisawa, Kayo; Hasumi, Atsushi; Shimizu, Takenori; Uchida, Yoshiaki*
Radiation Physics and Chemistry, 137, p.210 - 215, 2017/08
Times Cited Count：1 Percentile：10.58(Chemistry, Physical)Following the Fukushima Daiichi Nuclear Power Plant (NPP) accident, large-scale radiation monitoring and environmental clean-up activities have been conducted throughout the Fukushima region. Outside air temperatures there reach 40
C in summer and -20C in winter, which are beyond the quoted range of many radiation survey instruments. For the purpose, temperature performances of four types of portable Japanese survey instruments which are widely used in Fukushima were experimentally investigated with a temperature-controlled chamber.
Denki Gakkai Zasshi, 97(9), p.762 - 766, 1977/09
no abstracts in English
Mikami, Satoshi
no journal, ,
Based on a request from the Japan Health Physics Society, I will introduce the outline of large-scale environmental radiation monitoring which have been carried out after the Fukushima Daiichi Nuclear Power Station accident, as a project commissioned by the Ministry of Education, Culture, Sports, Science and Technology and later by the Nuclear Regulation Authority. I will report on monitoring methods, initial deposition status of radionuclides in the environment, and their subsequent temporal changes over time.
Sanada, Yukihisa; Mori, Airi
no journal, ,
A decade after the Fukushima Daiichi Nuclear Power Station (FDNPS) accident, ambient dose rates have decreased markedly compared to immediately after the accident. Airborne surveys using crewed helicopters and uncrewed aerial vehicles (UAV) are the best methods for obtaining an overall picture of the distribution. UAV-based radiological surveying is still ongoing around the FDNPP site. These helicopters have been developed by Yamaha Motor Co. Ltd. since the 1980s and are widely used in Japan for spraying agricultural chemicals. It features a flight time of up to 1.5 hours and a payload of up to 10 kg, and has excellent safety features. The measurement system on board the unmanned helicopter is a LaBr (Ce) detector (scintillator volume: 38 mL). For conversion to ground values, the simple IAEA TECDOC 1363 method is routinely used, but new methods are also being developed using machine learning with historical data acquired in the field as training data. The optimization of radiation measurement techniques and the establishment for logistics of nuclear disaster correspondence still faces many challenges. Recently, some fixed-wing type UAVs whose duration time of flight is more than 10 hours are already sold around the world. The fixed-wing type UAV was necessary for the correspondence immediately after the FDNPS accident, which includes the observation of the accidental situation, radiation plume tracking and so on. In this presentation, the experience and current situation for Fukushima environmental radiation monitoring will summarize and introduce the approaches and problems for preparedness of post-accident.
