根据美国毒理研究机构提出的持续繁殖实验的方法，观察高本底放射性饮水对小鼠生育力及仔鼠生长发育的影响。
Using continuous reproductive tests, fertility of mice and the development of their offspringswere observed to evaluate the safety of the high background radiation containing drinking water.
结果表明，各核素均未对长江造成污染，长江水系放射性浓度仍在本底水平。
The results showed that the radioactivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
目的对南水北调东线山东段通水前沿线流域的放射性本底水平进行评价。
Objective To assess the radiation background levels of Shandong basin in east line of northward rerouting of southern river.
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