Residual nuclear radiation is the hazard in fallout.

以及10%的剩余核辐射。剩余核辐射带来放射性尘降危害。

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Initial nuclear radiation will be a significant hazard with smaller weapons, but the fallout hazard can be ignored as there is essentially no local fallout from an air burst.

相比小型武器，早期核辐射的危害是很严重的。但是放射性尘降的危害可被忽略，因为空中爆炸基本上不会给地面带来尘降。

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In contrast with air bursts, local fallout can be a hazard over a much larger downwind area than that which is affected by blast and thermal radiation.

和空中爆炸相比，受局部核尘降影响的顺风区域要比冲击波和热辐射的影响区域大的多。

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Seismic tests have been done and drilling of exploratory wells is likely to begin next year, so Russia does not want any radiation hazard to overshadow that.

BBC: Russia explores old nuclear waste dumps in Arctic

Some other Nato countries also use munitions with DU, which has 40% less radiation than natural uranium, itself not considered a health hazard.

BBC: No DU weapons risk, say experts