Analysis of Japanese radionuclide monitoring data of food before and after the Fukushima nuclear accident.
Analysis of Japanese radionuclide monitoring data of food before and after the Fukushima nuclear accident.
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DOI：
10.1021/es5057648
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发表时间：
2015-03-03
影响因子：
11.4
通讯作者：
Steinhauser, Georg
中科院分区：
文献类型：
--
作者：
Merz, Stefan;Shozugawa, Katsumi;Steinhauser, Georg
在福岛核事故（2011年3月11日）发生后，日本政府采取了前所未有的食品放射性核素监测行动，以确保食品安全。在这项工作中，我们分析了大量数据集的一部分，特别是事故发生后第一年食物中的放射性污染。活动开始后，蔬菜中的活性浓度立即达到峰值，但它们迅速下降，因此到2011年初夏，只有少数样品超过了规定限值。后来，蘑菇和干货的积累又导致了几次超标。对肉类的监测工作起步迟缓，尤其是福岛县以外地区。经过一段时间的积累，肉类污染水平在2011年7月达到顶峰（牛肉）。放射性水平随后迅速下降，但在2011年9月再次达到峰值，这主要是由于野猪肉（一种已知的放射性铯蓄积物）。自来水污染较少；在2011年4月1日之前，所有对自来水的限制都被取消。福岛事故发生前，食物中的铯- 137和锶- 90含量（由大气核爆炸造成）通常低于0.5 Bq/kg，因此肉类中的铯- 137含量通常较高，而素食产品中的铯- 90含量通常较高。背景放射性锶和放射性铯的相关性表明，在福岛核事故后，90Sr的最大活度为各自137Cs浓度的10%的监管假设可能很快面临风险，因为90Sr/137Cs的比值随着时间的推移而增加。目前的日本食品政策应该考虑到这一点，因为目前的法规很快就会低估日本食品中的90Sr含量。
In an unprecedented food monitoring campaign for radionuclides, the Japanese government took action to secure food safety after the Fukushima nuclear accident (Mar. 11, 2011). In this work we analyze a part of the immense data set, in particular radiocesium contaminations in food from the first year after the accident. Activity concentrations in vegetables peaked immediately after the campaign had commenced, but they decreased quickly, so that by early summer 2011 only a few samples exceeded the regulatory limits. Later, accumulating mushrooms and dried produce led to several exceedances of the limits again. Monitoring of meat started with significant delay, especially outside Fukushima prefecture. After a buildup period, contamination levels of meat peaked by July 2011 (beef). Levels then decreased quickly, but peaked again in September 2011, which was primarily due to boar meat (a known accumulator of radiocesium). Tap water was less contaminated; any restrictions for tap water were canceled by April 1, 2011. Pre-Fukushima 137Cs and 90Sr levels (resulting from atmospheric nuclear explosions) in food were typically lower than 0.5 Bq/kg, whereby meat was typically higher in 137Cs and vegetarian produce was usually higher in 90Sr. The correlation of background radiostrontium and radiocesium indicated that the regulatory assumption after the Fukushima accident of a maximum activity of 90Sr being 10% of the respective 137Cs concentrations may soon be at risk, as the 90Sr/137Cs ratio increases with time. This should be taken into account for the current Japanese food policy as the current regulation will soon underestimate the 90Sr content of Japanese foods.
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影响因子：
2
作者：
KODAIRA, K
通讯作者：
KODAIRA, K
DOI：
10.3769/radioisotopes.50.80
发表时间：
2001-03-01
期刊：
Radioisotopes
影响因子：
--
作者：
Komamura, Misako;Tsumura, Akito;Kodaira, Kiyoshi
通讯作者：
Kodaira, Kiyoshi
影响因子：
4.7
作者：
Koizumi, Akio;Harada, Kouji H;Niisoe, Tamon;Adachi, Ayumu;Fujii, Yukiko;Hitomi, Toshiaki;Kobayashi, Hatasu;Wada, Yasuhiko;Watanabe, Takao;Ishikawa, Hirohiko
通讯作者：
Ishikawa, Hirohiko
影响因子：
5.9
作者：
Kobayashi, Yukiko;Hattori, Mikako;Kido, Yasuhiro
通讯作者：
Kido, Yasuhiro
DOI：
10.1073/pnas.1221834110
发表时间：
2013-06-25
影响因子：
11.1
作者：
Fisher, Nicholas S.;Beaugelin-Seiller, Karine;Garnier-Laplace, Jacqueline
通讯作者：
Garnier-Laplace, Jacqueline