Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 65(10): 409-414 (2016)


Observation of Tritium Behavior Both in Monthly Precipitation in Niigata City and in Spring Water at Top of Mt. Zao and Some Mountains in Fukushima Prefecture After the Fukushima Dai-ichi Nuclear Power Plant Accident

Graduate School of Science and Technology, Niigata University ◇ 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata-shi, Niigata Pref. 950–2181, Japan

受付日:2016年2月12日Received: February 12, 2016
受理日:2016年6月10日Accepted: June 10, 2016
発行日:2016年10月15日Published: October 15, 2016

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.

Key words: Fukushima Dai-ichi Nuclear Power Plants; monthly precipitation; tritium; non-sea-salt Ca2+; spring water; ion concentration in precipitation

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