In 2011, just before an earthquake struck the east coast of Japan, nearby researchers recorded surprisingly high concentrations of the radioactive isotope pair: radon and thoron.
2011年，就在地震袭击日本东海岸之际，附近的研究人员侦测到了高浓度的放射性同位素组：氡和钍，对此他们十分震惊。
thoron
/'θɔːrɒn/ /'θorɑn/
英汉-汉英词典
n. 钍射气
词组 | 习惯用语
您要查找的是不是：
- thrown v. 扔掉；抛（throw的过去分词）
- thorn n. 刺；荆棘
- thorough adj. 彻底的；十分的；周密的
- Thornton n. 桑顿（姓氏）
thoron n. [核] 钍射气；钍试剂; n. (Thoron)人名；(英)托龙;
网络短语:
thoron progeny 子体
thoron concentration 土浓度
thoron level 气土水平
thoron daughters 子体
thoron II 钍试剂
thoron chamber rn室
density of thoron daughter 子体浓度
radon and thoron daughter 氡子体
thoron in exhaled air 呼气
原声例句
英语百科
Radon 氡
（重定向自Thoron）
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![210Pb is formed from the decay of 222Rn. Here is a typical deposition rate of 210Pb as observed in Japan as a function of time, due to variations in radon concentration.[54]](/uploads/202502/16/Lead210inairatjapan2041.png)
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, Rn, has a half-life of 3.8 days. Radon is one of the densest substances that remains a gas under normal conditions. It is also the only gas under normal conditions that only has radioactive isotopes, and is considered a health hazard due to its radioactivity. Intense radioactivity has also hindered chemical studies of radon and only a few compounds are known.
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