土壤中238U、226Ra、210Pb、210Po在3种蔬菜中的转移及食用后剂量估算

研究了广东地区受铀矿污染的土壤中生长的芥菜、大白菜、苋菜的根、茎、叶中²³⁸U、²²⁶Ra、²¹⁰Pb、²¹⁰Po的含量分布情况,其中根为主要富集部位;3种蔬菜的转移系数皆在10^-3~10^-2水平,芥菜的²³⁸U和²²⁶Ra的转移系数之间存在相互影响,大白菜的²¹⁰Pb和²¹⁰Po的转移系数之间也存在相互影响关系;对公众每食入1 kg蔬菜所产生的待积有效剂量做了初步估算,²³⁸U贡献的剂量为0.001~0.105 μSv,²²⁶Ra为0.004~0.576 μSv,²¹⁰Pb为0.019~0.646 μSv,²¹⁰Po为0.010~1.30 μSv。

Transfer of 238U,226Ra,210Pb and 210Po from soil to three vegetables and dose estimation after ingestion

The distribution and content of ²³⁸U, ²²⁶Ra, ²¹⁰Pb and ²¹⁰Po in roots, stems and leaves of Brassica juncea, Brassica pekinensis and Amaranthus tricolor grown in the uranium contaminated soil of Guangdong district were analyzed. The results showed that the roots were the main enrichment part. The transfer coefficients of the three vegetables were all at the level of 10^-3-10^-2. The transfer coefficients of ²³⁸U and ²²⁶Ra of Brassica juncea were correlated while the transfer coefficients of ²¹⁰Pb and ²¹⁰Po of Brassica pekinensis were also correlated. According to the preliminary estimation of committed equivalent dose for public ingestion of 1 kg those vegetables, the dose of ²³⁸U ranged from 0.001 to 0.105 μSv, ²²⁶Ra ranged from 0.004 to 0.576 μSv, ²¹⁰Pb ranged from 0.019 to 0.646 μSv, ²¹⁰Pb ranged from 0.019 to 0.646 μSv.