134Cs and 137Cs in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part two: estimation of 134Cs and 137Cs inventories in the North Pacific Ocean
134Cs and 137Cs in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part two: estimation of 134Cs and 137Cs inventories in the North Pacific Ocean
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DOI：
10.1007/s10872-015-0332-2
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发表时间：
2016-02-01
影响因子：
2.3
通讯作者：
Gamo, Toshitaka
中科院分区：
文献类型：
--
作者：
Aoyama, Michio;Kajino, Mizuo;Gamo, Toshitaka
利用汇编数据和模型模拟，估算了东京电力公司福岛第一核电站（FNPP 1）事故释放到北太平洋的放射性铯的存量。通过比较观测清单和模式模拟结果，我们得到了12-15 PBq的Cs-137的大气沉降的FNPP 1事故在北太平洋。福岛核事故前，北太平洋的Cs-137活度约为69 PBq。因此，大气沉降新增的12-15 PBq的Cs-137和直接排放新增的3.5 +/-A0.7PBq的Cs-137使北太平洋的Cs-137总存量增加了22- 27%。我们还估算了释放到大气中的Cs-137总量为15-20 PBq，释放到环境中的Cs-137总量为19-24 PBq。事故发生时观测到的Cs-134与Cs-137的活度比接近于1，且非常均匀，因此，在北太平洋沉积的Cs-134总量、释放到大气中的总量、直接排放到海洋中的总量以及释放到环境中的总量与Cs-137的总量相同。
We estimated the inventories of radiocaesium released by the Tokyo Electric Power Company Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident to the North Pacific Ocean by using compiled data and model simulations. By comparing the observed inventories with model-simulated results, we obtained 12-15 PBq of Cs-137 for the atmospheric deposition released by the FNPP1 accident in the North Pacific Ocean. Before the Fukushima accident, Cs-137 activity in the North Pacific Ocean was about 69 PBq. Therefore, the 12-15 PBq of Cs-137 newly added by atmospheric deposition together with the 3.5 +/- A 0.7 PBq added by direct discharge increased the total Cs-137 inventory in the North Pacific Ocean by 22-27 %. We also estimated the total amount of Cs-137 released to the atmosphere to be 15-20 PBq, and the total amount of Cs-137 released to the environment to be 19-24 PBq, respectively. Observed Cs-134 to Cs-137 activity ratio at the time of accident was close to 1 and extremely uniform, therefore, the total amount of Cs-134 deposition in the North Pacific Ocean, that of released to the atmosphere, that of direct discharge to the ocean and that of released to the environment were the same amounts as those of Cs-137.