Outdoor radon levels are usually very low.
室外的氡水平通常很低。
氡是什么？
the routes available for the passage of radon into the home
可供氡进入家中的途径
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。
Estimate the global health impact of exposure to residential radon.
估计接触住宅中氡的全球健康影响。
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 inhaled, the radiation exposure from radon may lead to lung cancer.
当吸入之后，来自氡的放射暴露可导致人们罹患肺癌。
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。
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。
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。
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%。
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。
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。
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。
As radon progeny decay, they emit radioactive alpha particles and attach to aerosols, dust and other particles in the air.
氡子核在衰变时发射出放射性阿尔法粒子，这些粒子可附着于空气中的浮质、灰尘及其它粒子。
These sources of water normally have much higher concentrations of radon than surface water from rivers, lakes and streams.
这些水源通常比河流、湖泊和小溪的地表水具有高得多的氡浓度。
Radon escapes easily from the ground into the air, where it disintegrates through short-lived decay products called radon progeny.
氡很容易从地下释放到空气中并通过称为氡子核的短命衰变产物分解。
But some relativistic calculations suggested it might actually behave like a different element, the inert (and non-metallic) gas, radon.
但基于相对论进行的计算表明，它更像一种独特元素、惰性(非金属)气体氡。
The lower the radon concentration in a home, the lower the risk as there is no known threshold below which radon exposures carries no risk.
家中的氡浓度越低，风险也就越小，但尚不了解氡接触低于何浓度才无风险。
Radon exposure in homes can be easily mitigated during the construction of new homes, but existing buildings can also be protected from radon.
在建造新住宅时很容易减少住宅中的氡接触，但在现存建筑中也可防范氡。
As we breathe, radon progeny are deposited on the cells lining the airways where the alpha particles can damage DNA and potentially cause lung cancer.
当我们呼吸时，氡子核可堆积在呼吸道壁层的细胞上，而阿尔法粒子可破坏DNA并有可能引起肺癌。
External environmental causes of cancer are factors in the environment that increase risk of cancer such as air pollution, UV radiation and indoor radon.
外部环境致癌因素是指环境中导致罹患癌症的危险升高的因素，如空气污染、紫外线辐射及室内的氡等。
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