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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.
Ishigami, Tsutomu; Kobayashi, Kensuke; *
Proc. of the 6th Topical Meeting on Emergency Preparedness and Response, 0, p.319 - 320, 1997/04
no abstracts in English
*; Ishigami, Tsutomu; Kobayashi, Kensuke
29th Int. Symp. on Automotive Technology & Automation, 0, p.341 - 348, 1996/00
no abstracts in English
Ishigami, Tsutomu; *; Kobayashi, Kensuke
29th Int. Symp. on Automotive Technology & Automation, 0, p.349 - 356, 1996/00
no abstracts in English
Ishigami, Tsutomu; *; ; Kobayashi, Kensuke
Proc., Dedicated Conf. on Mechatronics & Supercomputing Applications in the Transportation Industries, 0, p.857 - 865, 1994/00
no abstracts in English
*; Ishigami, Tsutomu; ; Kobayashi, Kensuke
Proc., Dedicated Conf. on Mechatronics & Supercomputing Applications in the Transportation Industries, 0, p.865 - 871, 1994/00
no abstracts in English
; ; ; ; ; ;
JAERI-M 8752, 43 Pages, 1980/03
no abstracts in English
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.
Hiraoka, Hirokazu; Kawasaki, Kohei*; Kimura, Masanori; Togawa, Orihiko; Saito, Shota; Ezaki, Iwao*
no journal, ,
When the nuclear emergency occurs, inhabitants take the contamination inspection to evacuate. A large number of vehicle will come to the inspection area and make there congested. To do the quick inspection, simultaneous measurement of tires and wipers using the portable radiation portal monitors for vehicles is a key point. Consequently, we attempted the count rates obtained from tires and wipers are discriminated. First, the vehicle was driven at 5 km/h and the 
-ray counts rate was measured by the monitor. 
Ba sources were attached around the tire or on the wiper and measurements were taken 30 times each. Next, discrimination conditions based on a linear function were applied to the normalized count rates, with the maximum count rate of the measured values (Net value) set to 1.0, to evaluate the discrimination accuracy between the tire and the wiper. The evaluation results showed that the pattern with the source attached around the tire correctly discriminated 29 out of 30 times, while the pattern with the source attached on the wiper correctly discriminated 20 out of 30 times. It was found that in order to improve the accuracy of discrimination, the measurement method must be improved so that there is a large difference between measured values of the tire and the wiper.
Hiraoka, Hirokazu; Kawasaki, Kohei*; Kimura, Masanori; Togawa, Orihiko; Saito, Shota; Ezaki, Iwao*
no journal, ,
In nuclear emergency, vehicles which evacuating inhabitants use be taken the contamination inspection. For the quick inspection, it seems that realization of simultaneous inspection of tires and wipers by portable radiation portal monitors for vehicles is necessary. In order to fulfill the simultaneous inspection, the authors develop the measuring method which is able to suitably distinguish and evaluate each contamination. Monte Carlo simulation showed ahead that the new set-up of detectors improves the discriminative ability for contamination. In this study, based on the simulation results, the authors attached radiation sources to a vehicle, and verified the ability by the new-setup. As a result, the ability improved compared to one of the usual method.
Hiraoka, Hirokazu
no journal, ,
In nuclear emergency, vehicles which evacuating inhabitants use be taken the contamination inspection. For the quick inspection, it seems that realization of simultaneous inspection of tires and wipers by portable radiation portal monitors for vehicles is necessary. In order to fulfill the simultaneous inspection, we develop the measuring method which is able to suitably distinguish and evaluate each contamination. We attached radiation sources to a vehicle, and verified the ability by the usual-setup and the new-setup of detectors. As a result, the ability improved compared to one of the usual-setup. We continue to improve the ability.
