哈密地区环境沉降物^（90）Sr、^（137）Cs水平及其所致居民剂量评价

THE DEPOSTITION LEVEL OF ￣(90)Sr AND ￣(137)Cs IN ENVIRONMENTAL AND EVALUATE OF POPULATION-WEIGHED DOSE IN HAMI AREA

本文报告了哈密地区１９６５～１９９０年环境沉降物^（９０）Ｓｒ、^（１３７）Ｃｓ年平均沉降量分别为２１．８Ｂｑ·ｍ－２和４２．２Ｂｑ·ｍ－２，累计沉降量分别为５６６．４Ｂｑ·ｍ－２和１０９７．７Ｂｑ·ｍ－２。^（９０）所致居民有效剂量当量为３０．５ｕｓｖ（集体有效剂量当量为１２．５ｍａｎ·Ｓｖ），^（１３７）Ｃｓ为６０．４ｕｓｖ（集体有效剂量当量为２４．８ｍａｎ。Ｓｖ）．^（９０）Ｓｒ和^（１３７）Ｃｓ所致居民有效剂量当量远低于我国现行放射防护标准限制值。

This paper repors the annual average depostiton of (90)Sr and'(137)Cs in environmental in Hami_from 1965 to 1990, theyare 21.8,42,2Bq. m(-1) The cumulation deposits of (90)Sr and (137)Cs are 566.4,1097.7Bq. m(-2) .The population weighed annual effective dosc equiralent of (90)Sr is 30. 5usv (collective effective dose equiralent= 12. 5 man. sv), And (137)Cs is 60. 4usv (collective effective dose equivalent=24. 8 man. sv). The population weighed effective dose equivalent of (90)Sr and (137)Cs aremuchlower than the radiation protective stan dardin China nowadays.