中国人食入232Th的胃肠道吸收分数

目的 估算中国人食入^232Th的胃肠道吸收分数。方法 按文献介绍f1计算方法和近年所获我国成年男子膳食食品和器官组织中钍浓度研究结果，计算并比较采用浓度算术均值和中位数所获的f1结果。结果 按全国中位数和算术均值估算出的^232Th f1分别为0．00048和0．00028。结论 我国成年男子膳食摄入^232Th的f1应采用0．00048，该结果低于按UNSCEAR最新世界参考值估算的结果，但接近于亚洲国家印度或日本相应报道值和支持ICRP对膳食钍f1的最新推荐值0．0005。

Fractional Absorption in Gastrointestinal Tract of 232Th by Ingestion for Chinese Man

Objective To estimate fractional absorption in gastrointestinal tract (f 1) of 232Th by ingestion for the Chinese male adults.Methods According to f 1 calculation method in literature and results of Th concentrations in dietary foods and organ or tissues for the Chinese male abults,obtained in recent years,f 1 values were estimated from the median and mean Th concentrations and compared each other.Results The f 1 value from the median and mean Th concentrations was 0.000 48 and 0.000 28 respectively.Conclusion The f 1 of 232Th by ingestion for the Chinese male adults should be adopted as 0.000 48,being lower than estimated result from the world reference concentrations in UNSCEAR 2000 Report,but quite near to the relevant reported value from Asian countries,such as India or Japan,and supporting the latest recommended value 0.000 5 by ICRP too.