Radon comes from radium decay.
氡来自镭的衰变。
Radon is radioactive and hazardous.
氡有放射性，是有害物质。
Radon levels in homes can be reduced by
可通过以下方法降低家中的氡水平
氡和石棉。
Installing a radon sump system in the basement.
在地下室安装氡蓄贮系统。
Most of the radon-induced lung cancer cases occur among smokers.
氡引起的多数肺癌病例发生在吸烟者中。
Avoiding the passage of radon from the basement into living rooms.
避免氡从地下室进入生活用房。
Due to dilution in the air, outdoor radon levels are usually very low.
鉴于在空气中的稀释，室外的氡水平通常很低。
Identify effective strategies for reducing the health impact of radon.
确认减轻氡对健康影响的有效战略。
When radon ventilation fans are added radon levels can even be reduced further.
当增加氡换气扇时，可进一步降低氡的水平。
Scientists in China, Russia, and the United States measure radon in ground water.
中国、俄罗斯和美国的科学家测量地下水的氡含量。
Building codes should be implemented to reduce radon levels in homes under construction.
应采用建筑规范，在住宅建筑中减少氡的水平。
The risk of lung cancer increases by 16% per 100 Bq/m3 increase in radon concentration.
氡浓度每升高100Bq/m3，肺癌风险就增加16%。
The proportion of lung cancers attributable to radon is estimated to range from 3 to 14%.
氡引起肺癌的比率估计范围为3 - 14%。
On a global level, tens of thousands of lung cancer deaths annually can be attributed to radon.
在全球，氡每年可造成数万例肺癌死亡。
Radon is a chemically inert, naturally occurring radioactive gas without odour, colour or taste.
氡是一种自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.
氡是一种天然产生的放射性惰性气体，它无色、无味、无臭。
Significant health effects have been seen in uranium miners who are exposed to high levels of radon.
在接触高水平氡的铀矿工人中观察到显著的健康影响。
Radon levels are usually higher in basements, cellars or other structural areas in contact with soil.
氡水平在地下室、地窖或与泥土接触的其它结构区通常较高。
Overall, reducing radon exposure is an important contribution to the goal of good quality indoor air.
在总体上，减少氡接触对实现优质室内空气的目标具有很重要的作用。
Radon is a natural radioactive gas that occurs at higher than normal levels in certain parts of the U.S..
氡是一种天然的放射性气体，在美国某些地区浓度高于平均水平。
Passive systems of mitigation have been shown to be capable of reducing indoor radon levels by up to 50%.
无源的缓解系统已显示有能力使室内氡的水平降低多达50%。
Sims USES radioactive clocks to decipher volcanic processes, measuring and comparing two isotopes of radon.
西姆斯使用放射性计时器测定并比较氡的两种同位素，以此来解密火山的活跃程度。
EPA has noted that several thousand cases per year of lung cancer come from elevated levels of radon in homes.
EPA已经注意到每年来自于房屋氡飙升致肺癌的数千份案例。
Mines are notorious fordust and toxic gases such as carbon monoxide and radon, which can enterthe body via the lungs.
矿井中到处充斥着损害人体健康的矿尘及像一氧化碳、氡等有毒气体，这些都会通过呼吸由肺部进入人体。
For most people, the greatest exposure to radon comes from the home. The concentration of radon in a home depends on.
对多数人而言，接触的大部分氡来自家中。
Radon is estimated to cause between 3% and 14% of all lung cancers, depending on the average radon level in a country.
根据一个国家中的平均氡水平，氡估计造成所有肺癌的3%至14%。
Among those who smoke and are exposed to the same radon concentration, the risk of lung cancer is about 25 times greater.
在吸烟并接触相同浓度氡的人中，肺癌风险大约要高25倍。
Radon gas in the air is present worldwide, its concentration depending on the highly variable uranium content of the soil.
在世界各地，空气中都存在氡气，其浓度取决于土壤中差别极大的铀含量。
Indoors, radon levels are higher, with highest levels found in places such as mines, caves and water treatment facilities.
室内的氡水平较高，而矿山、岩洞和水处理设施等地方的氡水平最高。
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