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| Titel |
Tritium in Japanese precipitation following the March 2011 Fukushima Daiichi Nuclear Plant Accident |
| VerfasserIn |
Takuya Matsumoto, Teruyuki Maruoka, Gen Shimoda, Hajime Obata, Hiroyuki Kagi, Katsuhiko Suzuki, Koshi Yamamoto, Takehiro Mitsuguchi, Kyoko Hagino, Naotaka Tomioka, Chinmaya Sambandam, Daniela Brummer, Philipp Martin Klaus, Pradeep Aggarwal |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076475
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| Zusammenfassung |
| We have measured the concentrations of tritium in Japanese precipitation samples collected
after the March 2011 accident at the Fukushima Dai-ichi Nuclear Power Plant (FNPP1).
Tritium concentrations exceeding the pre-accident background level were detected at three
out of seven localities (Tsukuba, Kashiwa and Hongo) southwest of the FNPP1, with their
distances varying between 170 and 220 km from the source. The highest tritium content was
found in the first rainfall in Tsukuba after the accident, but its tritium content was about 500
times less than the regulatory limit for tritium in drinking water, so that the risk of radiation
from tritium released in the accident can be considered negligible. Tritium levels at the
localities studied here decreased steadily and rapidly with time and became indistinguishable
from the pre-accident values within five weeks. The atmospheric tritium level in
the vicinity of the FNPP1 during the earliest stage of the accident was roughly
estimated to be 1.5 Ã 103 Bq/m3, which is potentially capable of producing rainwater
exceeding the regulatory limit, but only in the immediate vicinity of the source. |
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