科研人员在加利福尼亚州的加州La Jolla发现了来自福岛第一核电站的放射性硫。通过一个建模分析，探测今年3月日本发生毁灭性的到自的放地震和海啸之后，这组作者说，福岛

PNAS：科研人员在加州探测到来自福岛的射性放射性硫

科研人员在加利福尼亚州的La Jolla发现了来自福岛第一核电站的放射性硫。

生物探索推荐英文论文摘要：

Evidence of neutron leakage at the Fukushima nuclear plant from measurements of radioactive 35S in California

Abstract

A recent earth*** and 科研the subsequent tsunami have extensively damaged the Fukushima nuclear power plant, releasing harmful radiation into the environment. Despite the obvious implication for human health and the surrounding ecology, there are no quantitative estimates of the neutron flux leakage during the weeks following the earth***. Here, using measurements of radioactive 35S contained in sulfate aerosols and SO₂ gas at a coastal site in La Jolla, California, we show that nearly 4 × 1011 neutrons per m2 leaked at the Fukushima nuclear power plant before March 20, 2011. A significantly higher ³⁵SO₄^-2activity as measured on March 28 is in accord with neutrons escaping the reactor core and being absorbed by the coolant seawater ³⁵Cl to produce ³⁵S by a (n, p) reaction. Once produced, ³⁵S oxidizes to ³⁵SO₂and ³⁵SO₄^-2and was then transported to Southern California due to the presence of strong prevailing westerly winds at this time. Based on a moving box model, we show that the observed activity enhancement in ³⁵SO₄^-2is compatible with long-range transport of the radiation plume from Fukushima. Our model predicts that ³⁵SO4^-2, the concentration in the marine boundary layer at Fukushima, was approximately 2 × 105 atoms per m³, which is approximately 365 times above expected natural concentrations. These measurements and model calculations imply that approximately 0.7% of the total radioactive sulfate present at the marine boundary layer at Fukushima reached Southern California as a result of the trans-Pacific transport.

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