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.
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。
3 hr Even higher radiation levels prompt the declaration of a general emergency.
3小时更高的辐射水平，促使电站宣布全面紧急状态。
3 hr Even higher radiation levels prompt the declaration of a general emergency.
3小时更高的辐射水平，促使电站宣布全面紧急状态。
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