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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 | |||
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| radium emanation; emanon | |||
| niton | |||
| radon | |||
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radon : 12 短语, 8 学科 |
| 一般 | 1 |
| 卫生保健 | 1 |
| 地球科学 | 3 |
| 技术 | 2 |
| 数学 | 1 |
| 环境 | 1 |
| 电子产品 | 1 |
| 通讯 | 2 |