Levels of artificial radionuclides and uranium in rain water collected from Ibaraki (Japan) following the Tomsk-7 accident in Russia |
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Authors: | Y Muramatsu K Tagami S Uchida |
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Institution: | (1) Division of Radioecology, National Institute of Radiological Sciences, Isozaki 3609, 311-12 Nakaminato-shi, Ibaraki, Japan |
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Abstract: | Measurements of some selected radionuclides were carried out in rain waters collected from Ibaraki Prefecture, Japan, following the nuclear accident at Tomsk-7, Russian Federation, in April 1993. The concentrations obtained for artificial radionuclides were90Sr 1.8 mBq l–1,137Cs 0.1 Bq l–1,131I 0.1 Bq l–1 and129I 4 Bq l–1. Uranium (238U) concentrations in rainfalls in April 1993 were 6.3–39 ng l–1. These data were compared to control values obtained previously and there was no appreciable influence on the radioactivity levels in Japan after the Tomsk-7 accident. Since only limited data on the concentrations of129I and uranium in rain water are available, these new analytical results contribute to understanding the background levels for these nuclides. |
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