【摘要】 用放射化学分析方法对哈密地区109份建材中天然放射性核素镭-226、钍-232、钾-40含量进行分析测定.结果表明,内、外照射指数分别为0.04-0.38和0.08-0.67,炉渣和花岗岩石最高,大理石和石灰、石膏最低.混合建材中镭-226、钍-232、钾-40含量(Bq/ kg)分别为 43.8, 40.0,594.0.建材所致居民内、外照射年有效剂量当量为 0.70mSv/ a,是我国《放射卫生防护基本标准》中规定公众个人年剂量当量限值5mSv的14.0％,不会对广大居民的健康造成有害的影响.更多还原

【Abstract】 Reported in this paper is an investigation on radioactivity contents in building materials in Hami prefecture by means of radioactive chemical analysis. The results show that internal and external exposure index are 0.04-0.38 and 0.08-0.67, respectively. Coal-slag-rnade bircks and granite were highest, marblc, limestone, gypsum were lowest. Contents of 226Pa, 232Th. 40K in mixed building materials were 43.8, 40.0, 594.0(Bq / kg), respectively. It have been estimated that the annual effective dose equivalent of internal and external irradiation to the local residents from building materials was 0.70m Sv/ a which is apparently lower than limit quantity of dose equivalent per capita set by the national standard.更多还原