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Sakuma, Shuhei; Watanabe, Yuki; Kuroe, Ayame; Takimoto, Misaki; Takashima, Hideki; Takada, Chie; Tsujimura, Norio
no journal, ,
no abstracts in English
Nishino, Saki; Nemoto, Ryo*; Hayashi, Hiroyuki*; Kobayashi, Daisuke; Isomae, Hidemi; Sakuma, Shuhei; Takimoto, Misaki; Okuyama, Shun; Unno, Motoyoshi; Kitao, Takahiko
no journal, ,
At the JAEA Tokai Reprocessing facility, especially workers engaged in Plutonium Conversion Development Facility (PCDF) are required strict radiation control due to working environment handling various nuclear material including plutonium (Pu) at short range. Because the equivalent dose limit of the lens of the eye stipulated by Japanese regulations has been revised downwards, we reassessed personal dose equivalent focusing on the lens of the worker's eye. The reassessment results indicate that wearing the appropriate radiation protection glasses is necessary for some workers who handle Pu including waste material in PCDF. Radiation management using protective glasses has started under revised radiation control plan.
Hashimoto, Suki*; Sakuma, Shuhei; Hosomi, Kenji; Watanabe, Yuki; Unno, Motoyoshi; Takashima, Hideki
no journal, ,
The standards for passive neutron personal dosimeters do not cover high-dose exposures such as criticality accidents, so the upper limit of the dose for personal neutron dosimeters is 20 mSv. On the other hand, the upper limit of dose during emergency work was raised to 250 mSv during the TEPCO Fukushima Daiichi Nuclear Power Plant accident caused by the Great East Japan Earthquake, so it is desirable that personal neutron dosimeters be able to support the upper limit of 250 mSv. In this study, we confirmed the availability of neutron dose evaluation of 250 mSv by irradiating neutron personal dosimeter using PADC detector called CR-39 with up to 300 mSv.