This fallout material decays over a long period of time, and is the main source of residual nuclear radiation.

尘降物需要很长的时间才会衰减，这是核辐射残留的主要来源。

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The residual nuclear radiation is defined as that which is emitted later than I minute from the instant of the explosion.

剩余核辐射是指在爆炸一分钟之后释放出来的辐射。

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The residual nuclear radiation is defined as that which is emitted later than I minute from the instant of the explosion.

剩余核辐射是指在爆炸一分钟之后释放出来的辐射。

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