一項研究探索了2011年3月福島核事故之后多種同位素在日本中、東部的地理分布,。
在這場事故發(fā)生之后,，諸如碲、碘和銫等放射性同位素被攜帶到了空氣中并且在大片地區(qū)沉積,，這可能污染農作物,。
Norikazu Kinoshita及其同事對來自日本中、東部地區(qū)的表層土壤進行了光譜分析,，從而確定這些同位素的地理分布,，這是朝著預測食用受污染的農作物可能導致的輻射暴露風險邁出的一步。
由于氣溶膠和水溶性氣體可能被徑流攜帶并通過降雨沉積到遙遠的地方,，這組作者追蹤了兩場地方降水（3月15日和21日）對放射性同位素輸送的作用,。
這組作者報告說，3月15日的降水很可能對福島縣記錄到的污染有影響,，飯館村和中通地區(qū)的輻射水平特別高,。
相比之下，3月21日的降水很可能把污染輸送到了東京,、茨城縣,、琦玉縣和千葉縣。這組作者說,，這些發(fā)現(xiàn)可能有助于評估日本的放射性污染的后果,。（生物谷 Bioon.com）
doi:10.1073/pnas.1111724108
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Assessment of individual radionuclide distributions from the Fukushima nuclear accident covering central-east Japan
Assessment of individual radionuclide distributions from the Fukushima nuclear accident covering central-east Japan
A tremendous amount of radioactivity was discharged because of the damage to cooling systems of nuclear reactors in the Fukushima No. 1 nuclear power plant in March 2011. Fukushima and its adjacent prefectures were contaminated with fission products from the accident. Here, we show a geographical distribution of radioactive iodine, tellurium, and cesium in the surface soils of central-east Japan as determined by gamma-ray spectrometry. Especially in Fukushima prefecture, contaminated area spreads around Iitate and Naka-Dori for all the radionuclides we measured. Distributions of the radionuclides were affected by the physical state of each nuclide as well as geographical features. Considering meteorological conditions, it is concluded that the radioactive material transported on March 15 was the major contributor to contamination in Fukushima prefecture, whereas the radioactive material transported on March 21 was the major source in Ibaraki, Tochigi, Saitama, and Chiba prefectures and in Tokyo.
