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Furuta, Sadaaki; Sumiya, Shuichi; Watanabe, Hitoshi; Nakano, Masanao; Imaizumi, Kenji; Takeyasu, Masanori; Nakada, Akira; Fujita, Hiroki; Mizutani, Tomoko; Morisawa, Masato; et al.
JAEA-Review 2011-035, 89 Pages, 2011/08
As a correspondence to the accident at the Fukushima Daiichi Nuclear Power Plant, the environmental radiation monitoring was performed at the Nuclear Fuel Cycle Engineering Laboratories, JAEA. This report presented the measurement results of ambient radiation dose rate, radioactivity concentration in the air and radioactivity concentration in fallout and meteorological observation result until May 31, 2011. The ambient radiation dose rate increased, with the peak dose rate of several thousand nGy/h at 7 o'clock in March 15, at 5 o'clock in March 16, and at 4 o'clock in March 21. The variation on the radioactivity concentration in the air and in fallout showed the almost same tendency as that of the dose rate. The concentration ratio of I-131/Cs-137 in the air increased to about 100. The dose was estimated resulting from internal exposure due to inhalation.
Yamagashira, Masaharu*; Tsujimura, Norio; Hoshi, Katsuya; Furuta, Takuya; Iwamoto, Yosuke; Sato, Tatsuhiko; Yokoyama, Sumi*
no journal, ,
no abstracts in English
Shibano, Koya; Okazaki, Hiro; Sumi, Mika; Kayano, Masashi; Matsuyama, Kazutomi; Kageyama, Tomio; Fujiwara, Hideki*; Furuta, Koya*; Yamaguchi, Kazuya*; Saito, Shingo*
no journal, ,
no abstracts in English
Motoki, Chika*; Furuta, Koya*; Yamaguchi, Kazuya*; Saito, Shingo*; Fujiwara, Hideki*; Shibano, Koya; Sumi, Mika; Kageyama, Tomio
no journal, ,
Certified Reference Materials (CRMs) of uranium and plutonium are necessary to perform Isotope Dilution Mass Spectrometry (IDMS) for nuclear material accountancy. Qualified Pu standard Material is a highly precious resource on a global scale. Therefore domestic securement of the material is strongly desired. JNFL entrust the development of preparation technique of Pu standard material to JAEA. Recently, purified Pu nitrate solution from MOX powder stored at JAEA was characterized. The framework for certification is presented in this brief.