我国膳食中~(90)Sr、~(137)Cs、~(226)Ra、~(228)Ra、~(210)Pb 和~(210)Po含量及其所致内照射剂量

作为1990年全国总膳食调查的放射性物质部分,本文报道了组成我国膳食的各类食品中~(90)Sr、~(137)Cs、~(226)Ra、~(228)Ra、~(210)Pb 和~(210)Po 含量的测定结果;按调查所得膳食组成和食品中核素含量,估算了我国居民(成年男子)当前这些核素经食入所致年摄入量和待积有效剂量当量。结果表明,每年食入所致总待积有效剂量当量约为0.24 mSv,贡献较大的食品是蔬菜、水产品和谷类,贡献较大的核素为~(210)Pb、~(210)Po 和~(228)Ra。这些结果更新了我国膳食中这些核素的资料,补充了来自饮水的数据。文中还讨论了我国膳食组成的地区差异及其对居民摄入量和所致内照射剂量的影响。

DETERMINATIONS OF ~(90)Sr,~(137)Cs,~(226)Ra,~(228)Ra,~(210)Pb,~(210)Po CONTENTS IN CHINESE DIET AND ESTIMATIONS OF INTERNAL DOSES DUE TO THESE RADIONUCLIDES

As a part of Chinese Total Diet Survey hold in 1990,this paper reports the determinedresults on ~(90)St,~(137)Cs,~(226)Ra,~(228)Ra,~(210)Pb and ~(210)Po contents in various foods of Chinese total diet.Based on obtained dietary composition and the determined contents,the Annual Intakes(AI)andCommitted Dose Equivalents(CDE)for the public by ingestion were estimated.It is shown that thetotal CDE for 6 radionuclides is about 0.24 mSv/a.The food categories and nuclides whose relativecontributions to the total are dominant were vegetablis,aquatic products and cereal,and ~(210)Pb,~(210)Po,~(228)Ra,respestively.The results update data from 1982 survey and complement important informationfor water consumption.The regional difference of dietary compositions and resultant internal doses arediscussed as well.