虽然这种云在高层大气中几乎不构成任何威胁，但是它在地面散发出的放射粒子的余波应该是任何监管机构所关注的。
Although such a cloud would pose virtually no threat while in the upper atmosphere, the fallout at the ground of radioactive particles from it should be a concern for any monitoring authority.
在奥斯陆（译注：挪威首都），新闻中播报了放射云正在挪威人口最稠密地区上空的消息以后，挪威辐射卫生研究所的电话被打爆了。
In Oslo, callers were on the phone to the State Institute for Radiation Hygiene afternews reports told of an invisible radioactive cloud over the most denselypopulated part of Norway.
火球和蘑菇云将放射性粒子推到上空，然后风将它们吹送到附近及远处。
The fireball and mushroom cloud carry radioactive particles upward, and the wind sends them near and far.
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