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Mikami, Satoshi; Tokiyoshi, Masanori*; Sato, Rina*; Tanaka, Daisuke*; Yoshimura, Kazuya
Nihon Hoshasen Anzen Kanri Gakkai-Shi, 23(1), p.10 - 17, 2024/06
Taisei Corporation and Infocube LAFLA Co., Ltd. have developed the smartphone-wirelessly-connected dosemeters, aiming to apply it to real-time exposure management of multiple decontamination workers. In order to grasp the basic characteristics of the developed dosemeters, they were calibrated and tested their characteristics such as energy dependency, angle of incidence dependency, etc. at photon calibration fields in Japan Atomic Energy Agency. The results showed generally good characteristics in each test. We evaluated that the dosemeters can be effectively used for decontamination work.
Sanada, Yukihisa; Tokiyoshi, Masanori*; Nishiyama, Kyohei*; Sato, Rina; Yoshimura, Kazuya; Funaki, Hironori; Abe, Tomohisa; Ishida, Mutsushi*; Nagamine, Haruo*; Fujisaka, Motoyuki*
Nihon Genshiryoku Gakkai Wabun Rombunshi (Internet), 22(2), p.87 - 96, 2023/04
Since the accident at the Fukushima Daiichi Nuclear Power Plant, many decontamination works have been carried out, but it is difficult to say that much data on workers' exposure has necessarily been analyzed in detail. In this paper, based on the GPS location information carried by the workers together with their personal dosimeters, the air dose rate in the work area and the characteristics of each type of work were analyzed. The results showed that more than 50% of the measured actual doses were more than twice the median planned dose calculated from the air dose rate and actual working hours. Furthermore, as a result of the analysis by work type, it was found that the exposure doses of demolition workers tended to be high, and that this was due to the fact that most of the work was carried out before the work was carried out to reduce the dose at the work site. In addition, when the conversion from air dose to effective dose was taken into account, there were many cases of underestimation where the planned values were lower than the measured values, and it is considered important for management to set appropriate working factor.
Kawase, Suguru*; Ito, Akira*; Tokiyoshi, Masanori*; Kawatsuma, Shinji; Fukushima, Mineo
no journal, ,
Electronic component of hydraulic machinery ROV that is using on-site of Fukushima Dai-ichi NPP was irradiated to Verify for radiation resistance. Estimation of threshold on total dose of for regular operation was executed.
Mikami, Satoshi; Sato, Rina*; Tokiyoshi, Masanori*; Tanaka, Daisuke*; Yoshimura, Kazuya
no journal, ,
no abstracts in English
Abe, Tomohisa; Sanada, Yukihisa; Tokiyoshi, Masanori*; Nishiyama, Kyohei*; Sato, Rina*; Yoshimura, Kazuya; Funaki, Hironori; Ishida, Mutsushi*; Nagamine, Haruo*; Fujisaka, Motoyuki*
no journal, ,
We attempted to analyze in detail the actual external exposure doses of workers involved in decontamination work, which had been difficult to analyze in detail until now, by recording location information and exposure doses using GPS. As a result, it was found that more than 50% of the planned exposure dose calculated from the air dose rate and the number of actual working hours were more than twice the median the measured exposure doses. Furthermore, analysis by work type showed that the exposure doses of demolition workers tended to be higher. This information on the external exposure dose of workers linked to location information is useful for detailed analysis of external exposure factors and will contribute to the optimization of future radiation protection programs for workers.