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ELMy H-mode discharges in JT-60UIsayama, Akihiko; Kamada, Yutaka; Hayashi, Nobuhiko; Suzuki, Takahiro; Oikawa, Toshihiro; Fujita, Takaaki; Fukuda, Takeshi; Ide, Shunsuke; Takenaga, Hidenobu; Ushigusa, Kenkichi; et al.
Nuclear Fusion, 43(10), p.1272 - 1278, 2003/10
Times Cited Count：139 Percentile：95.42(Physics, Fluids & Plasmas)no abstracts in English
Takahashi, Masato; Magara, Masaaki; Sakurai, Satoshi; Kurosawa, Setsumi; Sakakibara, Takaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Watanabe, Kazuo; Usuda, Shigekazu; Adachi, Takeo
Journal of Nuclear Science and Technology, 39(Suppl.3), p.568 - 571, 2002/11
In the environmental sampling and analyses for safeguards, precise isotope ratio determination of uranium at trace levels is required for detection of undeclared nuclear activities. Currently, swipe samples are being taken by IAEA from the nuclear facilities. The amount of uranium collected on the cotton swipe is expected to be in the wide range including the order of nano-gram or less. In order to measure the isotope ratios by ICP-MS, we have studied sample preparation procedures. Four pretreatments of swipe samples were examined: 1) nitric acid leaching, 2) dry ashing, 3) low-temperature plasma ashing, and 4) acid digestion. Preliminary results showed that the combination of 3) and 4) was favorable from the points of uranium blank, cross-contamination, chemical yield and manipulation conditions in a clean laboratory. It was found that the cotton swipe contained nano-gram levels of uranium as impurity. Since this value may seriously interfere with the isotopic analysis of uranium, selective recovery of the deposited uranium by means of mechanical method is also studied.
Magara, Masaaki; Sakakibara, Takaaki; Kurosawa, Setsumi; Takahashi, Masato; Sakurai, Satoshi; Hanzawa, Yukiko; Esaka, Fumitaka; Watanabe, Kazuo; Usuda, Shigekazu
Journal of Analytical Atomic Spectrometry, 17(9), p.1157 - 1160, 2002/09
Times Cited Count：11 Percentile：42.90(Chemistry, Analytical)no abstracts in English
Esaka, Fumitaka; Magara, Masaaki; Hanzawa, Yukiko; Sakurai, Satoshi; Taguchi, Takuji; Takai, Konomi; Sakakibara, Takaaki; Kurosawa, Setsumi; Takahashi, Masato; Yasuda, Kenichiro; et al.
Dai-22-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, 8 Pages, 2001/11
no abstracts in English
Usuda, Shigekazu; Watanabe, Kazuo; Sakurai, Satoshi; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Miyamoto, Yutaka; Yasuda, Kenichiro; Saito, Yoko; Gunji, Katsubumi*; et al.
KEK Proceedings 2001-14, p.88 - 92, 2001/06
no abstracts in English
Adachi, Takeo; Usuda, Shigekazu; Watanabe, Kazuo; Sakurai, Satoshi; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Yasuda, Kenichiro; Saito, Yoko; Takahashi, Masato; et al.
IAEA-SM-367/10/02 (CD-ROM), 8 Pages, 2001/00
no abstracts in English
