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分析了居民饮用水及其天然水源中微量铀、钍的含量，并与尿液中铀、钍含量进行了比较。结果表明，上海地区天然水源在国家规定的允许范围内，接近于尿液中轴、钍的日排出量。
The content of trace uranium and thorium in drinking water and its natural water source was analyzed and compared with the content of uranium and thorium in urine. The results show that the natural water source in Shanghai is within the allowable range stipulated by the state and is close to the daily discharge volume of the urinal axis and thorium.