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| niton (Em²² 射气同位素); emanon | |||
| radon (Rn, 86号元素，旧名 Niton,亦称 radium emanation) | |||
| Radon (niton); radium emanation | |||
| radon A radioactive gaseous element emitted naturally from rocks and minerals where radioactive elements are present. It is released in non-coal mines, e.g. tin, iron, fluorspar, uranium. Radon is an alpha particle emitter as are its decay products and has been indicted as a cause of excessive occurrence of lung cancer in uranium miners. Concern has been expressed at radon levels in some housing usually adjacent to granite rocks or old tin mining regions (从有放射性物质的石头和矿产中自然释放的放射性气体。产生于非碳的矿，例如锡矿、铁矿、氟石和铀矿。氡衰变产生阿尔法粒子辐射，并被认为是氟石矿的矿工多发肺癌的根源。在临近花岗岩或旧锡矿的地区，氡的浓度应被关注。) | |||
| radon | |||
| niton (Rn (旧用 Nt)); radon (Rn) | |||
| nito; niton | |||
| radon (化学元素，符号 Rn) | |||
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| radon (射气同位素,Em²²²) | |||
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| radon | |||
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| radon | |||
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氡 : 50 phrases in 10 subjects |
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