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人类生活在自然界,不断的受到天然辐射的内外照射。估算当地居民所受天然辐射的剂量具有特殊意义,它可以提供天然本底资料,以利于对人工污染的发现,及时采取相应的措施。在我区,有关外照射的情况我们已有资料报道,而关于居民所受内照射剂量的资料尚属缺如,为弥补这一空白,我们于1984年～1985年,对宁夏全区居民的12种主要食品,进行了天然铀、钍及镭-226含量的调查,并估算出宁夏居民由食入食品所致的内照射剂量。
Human life in nature, continue to be exposed to natural radiation inside and outside. It is of special significance to estimate the natural radiation dose received by local residents. It can provide natural background information to facilitate the detection of artificial pollution and take appropriate measures in time. In our district, we have reported some information about external radiation. However, information on the amount of internal radiation received by residents is still lacking. To make up for this gap, from 1984 to 1985, 12 kinds of main foodstuffs, investigated the content of natural uranium, thorium and radium-226, and estimated the internal radiation dose caused by food ingested by Ningxia residents.