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1983年4～7月对南充地区所属203个(乡)的226个点进行了天然辐射水平与剂量调查,获得数据3420个,并估算出南充地区居民个人平均年有效剂量当量、居民年集体
From April to July 1983, 226 natural and radiation levels of 203 (township) townships in Nanchong were surveyed with 3420 data, and the average annual effective dose equivalent of residents in Nanchong was estimated.