科研之友
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摘要
We measured the concentrations of several radionuclides in atmospheric deposition samples collected in the period from 2000 to 2012 at Rokkasho, Japan. Monthly Be-7 deposition rates were higher in winter/spring and fall, and monthly Pb-210 deposition rates were highest in winter/spring. Following the accident at the Fukushima Dai-ichi Nuclear Power Plant in March 2011, the radiocesium (Cs-134 and Cs-137) deposition rate rapidly increased until it reached the maximum in April 2011, after which the deposition rate of Cs-137 decreased with a half-time of 22 days before remaining constant throughout 2012.
- 出版日期2015-2
