【摘要】 对1979,1980两年长江水系水体、鱼类及部分江底沉积物中天然铀含量进行了分析测定。所得结果表明,水中天然U含量变化,从上游至下游呈现逐渐减低的趋势。枯水期普遍高于丰水期。其均值分别为2.2×10^-2Bq/L和1.79×10^-2Bq/L,波动范围分别为（0.15～4.21）×10^-2Bq和（0.13～3.06）×10^-2Bq/L。总均值为2.04×10^-2Bq/L。枯水期最高点出现在武汉汉江,最低点为鄱阳湖。丰水期最高点为嘉陵江中渡口,最低点也是鄱阳湖。所测各点的均值均低于国家露天水源U限制标准。鱼类总均值（鱼肉）为4.18×10^-2Bq/kg。不同种类鱼的含铀量有差异。裂腹鱼最高,为9.44×10^-2Bq/kg。尖头鱼最低,为1.6×10^-2Bq/kg。浓集因数也是裂腹鱼最高,为4.5;尖头鱼最低,为0.53。总的趋势是鱼骨含U高于鱼肉。调查结果表明,鱼体中天然U含量均低于我国食品放射性限制标准。所致居民的年摄入铀量及剂量估算结果均低于UNSCEAR1986年报告书的估算值。更多还原

【Abstract】 The uranium content in water and fish in Yangtze River is determined in 1979,1980. The results of U content are given, it shows a change trend from high to low in U content from upper to lower. The average in the dry water period is higher than the rich water period, the range is (0.15~4. 21) X 10~2 Bq/L and (0.13~3.06) X 10~2Bq/L respectively. Total average is 2.04X10"2 Bq/L, lower than standard limit in China. The average of U content is 4.18X 10~2Bq/kg in fish meat.There is great difference of U content among various fishes, the highest value is 9.44X 10~2Bq/kg, the lowest is 1. 60 X 10~2Bq/kg in fish meat.The U cumulative coefficient for various species of fish, the highest value is 4.5, the lowest is 0.53, but the U content in all fishes determined is below standard limit of foodstuffs radiation in China.The results of dose estimation and annual intake by inhabitant show that is below UNS-CEAR report 1986.更多还原