RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 65 , Issue 10
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  • Ying Wang, Shogo Morita, Noriaki Kataoka, Hiroshi Imaizumi, Naoki Kano
    2016 Volume 65 Issue 10 Pages 409-414
    Published: October 15, 2016
    Released: October 15, 2016
    JOURNALS OPEN ACCESS

    In 2011, the released radioactive materials including tritium (T) from damaged reactors at Fukushima Dai-ichi nuclear power plant has caused much environmental problems. After the Fukushima Dai-ichi Nuclear Power Plant Accident, the specific activity of T in precipitation was increased in Niigata city. In this study, each monthly precipitation (imitative ground infiltrated precipitation) was collected at the rooftop of Niigata University. Such a sample was subsequently enriched by electrolytic enrichment method (SPE method), and the specific activity of T of each enriched sample was measured by low-background liquid scintillation counter. In addition, the relation between specific activity of T and nssCa2+ (i.e., non-sea-salt Ca2+) concentration in monthly precipitation was also discussed. Moreover, the concentrations of cations, i.e., Na+, K+, Ca2+, and Mg2+, in monthly precipitation and the specific activity of T in spring water at top of Mt. Zao (and other mountains in Fukushima prefecture) were also measured. Based on the above-mentioned matters, it was found that the influence of the Fukushima Dai-ichi Nuclear Power Plant Accident on environment in Niigata city almost disappeared after four months from the accident.

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  • Keiko Tagami, Shigeo Uchida
    2016 Volume 65 Issue 10 Pages 415-420
    Published: October 15, 2016
    Released: October 15, 2016
    JOURNALS OPEN ACCESS

    Brown rice of non-glutinous paddy rice (Oriza sativa) was used to investigate radiocaesium translocation to grains by selecting hulled rice and unsuitable rice grains for food. It was assumed that hulled rice was not mature enough to remove hulls compared to mature rice so that hulled rice was classified as immature rice. The unsuitable rice grains were such as colored or not proper shape ones, thus it was though that they were disturbed their filling process and thus their nutritional condition was not in the same level as the normally grown mature grains. The weight of immature rice grains had about 95% of normal-weight grains and thus it was indeed slightly immature but the 137Cs concentration was almost the same as that of the normal mature grains. On the other hand, unsuitable grains were low in 137Cs concentration by 14%, suggesting that translocation of radiocesium was affected from early stage of filling process. Probably the decrease would occur especially if germs and/or aleurone layer were damaged.

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Serial Lecture
Neutron Scattering Study on Dynamics of Atomic and Molecular Motions
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