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Science:某些美国核弹试验场的辐射现在比中央公园还小

标签:核试验 辐射
摘要 : 马绍尔群岛在20世纪40年代和50年代时曾是美国必不可少的核试验场之一:在此期间进行的差不多200次核测试中有67次发生在这些偏远的太平洋岛屿上。

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马绍尔群岛在20世纪40年代和50年代时曾是美国必不可少的核试验场之一:在此期间进行的差不多200次核测试中有67次发生在这些偏远的太平洋岛屿上。现在,在最后一颗核弹爆炸后近60年后,它们中因为曾经进行过核测试而被废弃的一部分岛屿终于准备好了迎接人类回迁。这对马绍尔群岛居民来说可能是一种解脱,他们现在挤在几个未受影响的离岛上生活,而这些岛正变得日益拥挤。为了确认这些试验场是否再度安全宜居,研究人员分别对六个受影响的岛屿、一个未受影响的岛屿,以及纽约市的中央公园里的破坏性伽玛射线辐射进行了测量。六个受影响岛屿中的五个每年的伽玛辐射在人类宜居阈值,即100毫雷姆以下,平均每个不到40毫雷姆/年,今天在《美国国家科学院院刊》发表的一项研究称。第六个岛屿,比基尼岛,的辐射水平相对较高,达到每年184毫雷姆。而同时,纽约中央公园的辐射量测出为每年100毫雷姆,可能是由于公园里的花岗岩带来的背景辐射。这些岛屿的低伽马辐射水平给回迁带来了希望,但在同意马绍尔岛民回迁之前,研究人员还需要研究他们可能会吸收辐射的其它方式,比如饮食。

原文链接:

Some U.S. nuke testing sites are now less radioactive than Central Park

原文摘要:

The Marshall Islands were one of the United States’s go-to nuclear testing sites in the 1940s and 1950s: Sixty-seven of the almost 200 tests during that period took place in these remote Pacific islands. Now, almost 60 years after the last bomb dropped, some of the islands abandoned because of the testing may finally be ready for humans to move back. That could be a relief for the Marshallese who are squeezed onto several unaffected—but increasingly overcrowded—islands. To find out whether the test sites are once again safe for humans, researchers took measurements of damaging gamma radiation on six affected islands, one unaffected island, and New York City’s Central Park. Five of the six islands fell below the 100 millirem per year threshold for human habitation, each averaging less than 40 millirem per year, according to a study published today in the Proceedings of the National Academy of Sciences. The sixth, Bikini Island, had a much higher level of radiation, at 184 millirem per year. Meanwhile, Central Park itself clocked in at 100 millirem per year, probably because of background radiation from granite found in the park. These low gamma radiation levels are promising, but researchers still have to study other ways people on the islands could absorb radiation—like through their diet—before giving Marshall Islands inhabitants the green light to move back.

来源: Science 浏览次数:0

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