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Journal Articles

Seasonal characteristics of chemical compositions of the atmospheric aerosols collected in urban seaside area at Tokaimura, eastern central Japan

Fu, F.; Watanabe, Kazuo; Yabuki, Sadayo*; Akagi, Tasuku*

Journal of Geophysical Research, 109(20), p.D20212_1 - D20212_9, 2004/10

Size-separated aerosol samples were collected at Tokaimura urban seaside area of Japan using an Andersen type sampler during July 2002 to July 2003. The size-separated aerosols were divided into water-soluble and insoluble fractions, and chemical compositions (Na$$^{+}$$, Cl$$^{-}$$, NH$$_{3}$$$$^{+}$$, NO$$_{3}$$$$^{-}$$, SO$$_{4}$$$$^{2-}$$, Al, Ca, Mg, Fe, Pb, Th and U) in both water-soluble and insoluble fractions were analyzed. Then, the seasonal variations and the size-distribution in mass concentration and chemical composition have been investigated in detail. Our results showed that the atmospheric aerosol in Tokaimura was obviously affected by dust storm in China, and that sea-salt particles were bigger than those in the Antarctic and were deficient in chlorine.

Journal Articles

Analysis of dose distribution for heavily exposed workers in the first criticality accident of Japan

Endo, Akira; Yamaguchi, Yasuhiro

Radiation Research, 159(4), p.535 - 542, 2003/04

https://doi.org/10.1667/0033-7587(2003)159[0535:AODDFH]2.0.CO;2
 Times Cited Count：14 Percentile：39.76(Biology)

The first criticality accident in Japan occurred in a uranium processing plant in Tokai-mura in September, 1999. In this accident, two workers on the site were heterogeneously exposed to neutrons and $$gamma$$ rays produced by the nuclear fission. Heterogeneous exposure influenced the clinical course observed in the skin and organs of these workers. By request from medical groups, we attempted to clarify the dose distribution of the two heavily exposed workers with the aid of computer simulation, which is currently the only means by which to address this complicated problem. This paper presents elucidated skin dose distributions, depth dose distributions inside the trunk, and neutron-to-$$gamma$$ dose ratios.

Journal Articles

Criticality accident at Tokai-mura

Uchida, Masaaki

IAEA Regional Workshop on Accident Management and Emergency Response for Research Reactors, 11 Pages, 2002/00

no abstracts in English

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