北京谱仪BES辐射本底水平是由大厅内的辐射水平决定的。
The radiation background of BES detector depends on the radiation level in the BES experimental hall.
降低厅内的辐射水平是减少BES的辐射本底和提高BES探测效率和“信噪比”的重要途径。
The way to reduce radiation level of experimental hall is very important for suppression of radiation background of BES and improvement of detection efficiency.
本文主要介绍了重离子加速器核物理实验在线测量中为降低辐射本底而采用的多层组合屏蔽设计。
A shielding design with multilayer combination has been introduced for on-line measurement of nuclear physics experiment with heavy ion accelerator.
结论这种私自开采铀矿已造成了被污染环境生活群体的剂量大大超过天然辐射本底的正常水平，应予以关注。
Conclusion Illegal uranium mining had brought about the fact that the annual effective dose of the inhabitants who lived in contaminated environment was makedly high above the normal level.
费米实验室到霍姆斯塔克的距离是到首丹的两倍，而霍姆斯塔克深度也是首丹的两倍，也就是说霍姆斯塔克本底辐射极为微弱。
The distance fromFermilab to Homestake is twice that to Soudan, and Homestake is alsotwice as deep, which means that background radiation would be extremelylow.
其他国家迄今测量到的辐射程度，远低于大多数人每天都会受到的本底辐射水平。
Radiation levels measured to date in other countries are far below the level of background radiation that most people are exposed to in every day circumstances.
有意思的是，电厂里的本底辐射水平低于莫斯科中心的本底辐射水平。
It is an interesting fact that background radiation level in the power plant is lower than in the center of Moscow.
但其检测量大大高于自然本底辐射量一万倍。
But natural background radiation is more than 100, 000 times the highest levels detected.
但其检测量大大高于自然本底辐射量一万倍。
But natural background radiation is more than 100,000 times the highest levels detected.
核辐射对生物有害，而长时间高水平的本底辐射对生态系统有何影响，人们还知之甚少。
Radiation is harmful to living things, yet the long-term effects of persistently high levels of background radiation on ecosystems are poorly understood.
科学测量结果显示，普通美国人每年受到的辐射为620毫仑目，其中一半属于天然本底辐射，而低于100,000毫仑目的辐射完全不需要担心。
By scientific measures, the average American gets 620 millirems of radiation each year, half from background exposure, and that number needs to reach 100,000 to be worrisome.
目的估算阳江高本底辐射慢性照射可能导致的实体癌超额相对危险。
Objective To estimate the excess relative risk for solid cancer associated with chronically exposure to high-background natural radiation in Yangjiang area of China.
从生物机理上说，我们可能已经习惯了这种本底辐射。
Possibly we are accustomed, biologically speaking, to this background radiation.
从生物机理上说，我们可能已经习惯了这种本底辐射。
Possibly we are accustomed, biologically speaking, to this background radiation.
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