我们家中的氡是接触致电离辐射的主要来源，在许多国家中占大众接触自然发生的辐射源的50%。

Radon in our homes is the main source of exposure to ionizing radiation, and accounts for 50% of the public's exposure to naturally-occurring sources of radiation in many countries.

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热辐射密度以核爆点距离平方倒数的速度衰减，爆炸、冲击波、致电离辐射效应的衰减速度则更快。

The intensity of thermal radiation decreases only as the inverse square of the distance from a nuclear detonation, while blast, shock, and prompt ionizing radiation effects decrease more rapidly.

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由高空爆炸产生的致电离辐射在被吸收之前能够传播几百英里，产生明显的高层大气电离(电离层)。

The ionizing radiation from the high altitude burst can travel for hundreds of miles before being absorbed. Significant ionization of the upper atmosphere (ionosphere) can occur.

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