辐射来自于外层空间（宇宙射线），以及在土壤，水和空气中的天然放射性物质。
The radiation comes from space (cosmic rays) as well as natural radioactive materials found in the soil, water and air.
氡是一种天然产生的放射性惰性气体，它无色、无味、无臭。
Radon is a chemically inert, naturally occurring radioactive gas. It has no smell, colour or taste.
核能比天然气的污染少，但是成本太高，而且因为放射性废物处置存在的高度危险性而被美国上下置疑。
Nuclear energy is less polluting than gas from a climate-changing perspective, but it is costly and viewed skeptically in the United States because of the dangers of disposing of radioactive waste.
粒子是从天然放射性蜕变得到的带正电的氦核。
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
放射性沉降物中含有非天然的重元素和同位素。
The fallout contained heavy elements and isotopes not found in nature.
本文报道了江苏省江河、湖泊、泉、井、近海海域和自来水中天然放射性核素浓度的调查结果。
This paper reports the investigation results of natural radioactivity level in river, lake. spring, well and tap water in Jiangsu Province.
天然放射性辐射环境与该区域内的地质环境密切相关。
There is close relationship between the radioactivity and the area's geology in environment.
本文报道了青海省江河、湖泊、水库、泉、井和自来水中天然放射性核素浓度的调查结果。
This paper reports the investigation results of natural radioactivity level in river, lake, reservoir, spring, well and tap water in Qirighai Province.
本文报道了北京市河流、湖泊、水库、温泉、井和自来水中天然放射性核素浓度的调查方法及主要结果。
This paper reports the investigation results of natural radioactivity level in river, lake, reservoir, spring, well and tap water in Beijing City.
本文报道了湖北省江河、湖泊、水库、温泉、农村井水和城市自来水中天然放射性核素浓度的调查结果。
This paper reports the investigation results of natural radioactivity level in river, lake, reservoir, spring, well and tap water in Hubei Province.
本文报道了云南省江河、湖泊、水库、泉(温泉)、井和自来水中天然放射性核素浓度的调查结果。
This paper reports the investigation results of natural radioactivity level in river, lake, reservoir, spring, well, offshore water and tap water in Yunnan Province.
本文总结了全国环境天然放射性水平调查外照射测量的质量保证工作。
This paper summarizes the quality assurance work of external exposure measurement for national survey of environmental natural radioactive level.
氡是天然放射性惰性气体，是铀系衰变链中的一个衰变产物。
As a product from the uranium disintegration, radon is a natural radioactive idle gas.
研究表明，绝大多数天然宝石所含放射性物质是极其微弱的，故不会对人体健康构成危害。
The research result shows most natural gems contain so little radioactive minerals that they can' t he harmful to health.
禁止利用渗井、渗坑、天然裂隙、溶洞或者国家禁止的其他方式排放放射性废液。
The use of seeping Wells, seeping pits, natural crevices, limestone caves or other means of discharge forbidden by the State for liquid radioactive waste is prohibited.
测定了在该泉水中养殖的鱼类及用该泉水灌溉生长的农作物和其他有关环境生物样品中天然放射性物质的含量。
The natural radioactive substance content was determined for fishes, in thermal spring water, farm products irrigated with such water and other biological samples.
本文报道了河北省河流、湖泊、水库、海水、泉水、农村井水以及城镇自来水中天然放射性核素浓度的调查结果。
This paper reports the investigation results of natural radioactivity level in river, lake, reservoir, spring, well and tap water in Hebei Province.
通过大量的实验和野外测量，对城市环境天然放射性评价方法进行了研究。
The methods of urban environment's natural radioactivity were investigated through abundances of experiments and field measurements.
报道了闽东南地区土壤岩石中天然放射性核素含量调查的结果。
This paper reports on the survey of natural radio nuclides in soil and rock conducted in Southeast Fujian.
基于钾的天然放射性，用放射性方法测定固体钾肥产品中的钾含量。
Based on the natural radioactivity of potassium, the contents of potassium in solid potash fertilizer products were determined by radioactivity method.
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.
中国土壤中天然放射性核素含量调查（1983—1990年）是中国环境天然放射性水平调查研究的一部分。
The survey of natural radionuclide contents in soil in China(1983—1990)is a part of investigation of environmental natural radioactivity level on China.
评价结果表明，下庄铀矿田的土壤中天然放射性水平处于正常范围。
The results show that there is a normal level of natural radioactivity of soil in the Xiazhuang granite uranium ore field.
一种碳的天然放射性同位素，原子量为4，半衰期为5，780年，用于测定古代生物标本，地质标本或考古遗迹的标本的年代。
A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.
程序在有天然放射性同位素和裂变产物存在下也是可用的。
In the presence of naturally radioactive isotopes and fission product...
报导安徽省天然辐射的空气吸收剂量率和饮食中天然放射性核素的浓度。
This paper reports absorbed dose rate in air for natural radiation and concentration radionuclides for food.
需要指出的是，授权审批登记的矿种，不包括石油、天然气和放射性矿产等特定矿种。
It should be pointed out, however, that the local review and registration rights are not applicable to the special types of minerals such as petroleum, natural gas and radioactive minerals.
需要指出的是，授权审批登记的矿种，不包括石油、天然气和放射性矿产等特定矿种。
It should be pointed out, however, that the local review and registration rights are not applicable to the special types of minerals such as petroleum, natural gas and radioactive minerals.
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