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.
调查结果表明，上海市各类水体中天然放射性核素浓度属正常本底水平。
The results show that the radioactivity level of varied water bod-ies of the city was within normal natural background.
在研究移动物体放射性监测报警技术的背景下，对环境本底的统计特性进行了研究。
When studying alarming technology of moving radioactive monitors, we study the statistical characteristic of environmental radiation background.
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.
文中较全面地介绍了电站运行前的环境放射性本底水平调查和电站的环境监测系统。
This paper completely introduces the investigation of environmental radioactive background level before the commissioning of power plant and environment monitoring system of power plant.
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 raioac-tivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
本文报道了厦门口岸放射性本底的调查情况。
This paper reports the survey of radioactive basic standard in Xiamen Port.
调查结果表明，宁夏回族自治区水体中天然放射性核素浓度属正常本底水平。
The results show that the radioactivity level of varied water bodies of the region was within normal natural background.
大理石的天然放射性属于环境本底水平，花岗岩中放射性远远高于大理石产品。
Natural radioactivity in the marble is equal to the environmental level, radioactivity in the granite is much higher than that in marble.
本文主要介绍秦山核电厂运行前的环境放射性本底调查的方法和结果，同时简要概述了运行中的环境监测计划。
The background survey methods and results of preoperational environmental radio activity around Qinshan NPP are introduced in this paper.
本文主要介绍秦山核电厂运行前的环境放射性本底调查的方法和结果，同时简要概述了运行中的环境监测计划。
The background survey methods and results of preoperational environmental radio activity around Qinshan NPP are introduced in this paper.
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