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| gen. |
镭射气第86号元素; 氯Rn; 氡 Rn (射气同位素,Em²²²) |
| agric. |
氡 (Rn, 86号元素，旧名 Niton,亦称 radium emanation) |
| avia. |
〔化〕 氡 |
| earth.sc. |
氡化学元素 |
| el. |
氨Rn［放射性气体］ |
| life.sc. |
氡 |
| met. |
氡 (Rn) |
| space |
氡 (化学元素，符号 Rn) |
| sport., med. |
氨; 镭射器 |
| tech. |
镭射气 |
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| chem. |
氡 (niton) |
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|
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 ['reidɔn] n | |
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| environ. |
氡 (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。) |
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| English thesaurus |
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Radon ['reɪdɒn, -dɑːn] abbr. | |
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| abbr., scottish |
Rn |
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| mil. |
radar beacon |
