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用GB14 883 .1 94中给出的方法对青海湖盐中天然和人工放射性水平进行采样和放射化学分析。结果显示 ,湖盐、食盐、囟水中天然和人工放射性2 3 8U、2 3 2 Th、2 2 6Ra、90 Sr、13 7Cs的水平 (Bq·Kg-1)分别为 :湖盐 2 61± 0 74、1 3 8± 0 89、6 44± 2 14、5 8 78± 3 7 89、3 8 47± 2 4 3 7;食盐 1 2 4± 1 12、0 89± 1 0 2、7 99± 1 0 8、79 70± 2 1 79、3 4 74± 3 9 48;囟水0 97± 0 72、0 2 4± 0 13、2 3 4± 0 46、2 9 0 0± 6 89、11 44±7 0 5。根据食盐中天然、人工放射性核素2 3 8U ,2 3 2 Th ,2 2 6Ra ,90Sr ,13 7Cs含量估算居民年摄入量 (Bq·a-1)分别为 :2 70、1 95、1 75× 10 1、1 74× 10 2 、7 61× 10 1;所致人体内 5 0年的待积剂量当量 (mSv)分别为 :8 2 4× 10 -4 、7 2 2× 10 -2 、2 67× 10 -1、3 14× 10 -4 、5 17× 10 -2 。年摄入量及估算剂量均未超过国家规定的限值。
Sampling and radiochemical analysis of natural and artificial radioactive levels in the salt of Qinghai Lake were performed using the method given in GB14883.194. The results showed that the levels of Bq · Kg-1 of natural and artificial radioactive 238 U, 23 2 Th, 226 Ru, 90 Sr and 13 7Cs in lake salt, salt, and brine were 21 ± 0 74,1 3 8 ± 0 89,6 44 ± 2 14,5 8 78 ± 3 7 89,3 8 47 ± 2 4 3 7; Table salt 1 2 4 ± 1 12,0 89 ± 1 0 2,7 99 ± 1 0 8,79 70 ± 2 1 79,3 4 74 ± 3 9 48; water 0 97 ± 0 72 0 2 4 ± 0 13,2 3 4 ± 0 46,2 9 0 0 ± 6 89,11 44 ± 7 0 5. According to the natural and artificial radionuclides, the annual inhabitants’ intake (Bq · a-1) were estimated as 2 3 8U, 2 3 2 Th, 2 2 6Ra, 90Sr and 13 7Cs respectively: 2 70,1 95,1 75 × 10 1,1 74 × 10 2, and 7 61 × 10 1, respectively; the equivalent mesenchymal equivalents (mSv) in the human body after 50 years were respectively 8 2 4 × 10 -4, 7 2 2 × 10 -2 , 2 67 × 10 -1, 3 14 × 10 -4, 5 17 × 10 -2. Annual intake and estimated dose did not exceed the limits prescribed by the state.