氡气测试----不要睡在火山口上
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http://wiki.answers.com/Q/What_does_radon_decay_into
What does radon decay into?
222Rn is the only natural isotope of radon. (Several other artificial isotopes are known, but about the only place they exist is in the physics lab. Let's work with the natural one.) This isotope is itself the daughter of 226Radium, by the way. (226Ra had to decay to create 222Rn.) The decay scheme for radon is as follows:
222Rn will alpha decay (half life of 3.8 days) into 218Po
218Po will alpha decay (half life of 3.1 minutes) into 214Pb
214Pb will beta decay (half life of 27 minutes) into 214Bi
214Bi will beta decay (half life of 20 minutes) into 214Po
214Po will alpha decay (half life of 160 microseconds) into 210Pb
210Pb will beta decay (half life of 22 years) into 210Bi
210Bi will beta decay (half life of 5 days) into 210Po
210Po will alpha decay (half life of 138 days) into 206Pb (stable)
In case it isn't obvious, radon and its daughters are all radioactive and pose a hazard. (Save lead, 206Pb, the final daughter.) And because radon is a gas and is inert, it travels around in the air and can be inhaled. And an airborne radionuclide is harder to defend against and contain than a liquid or solid one. Radon is suspected of accounting for a high percentage of lung cancer deaths since exposure to radiation can cause cancer.
What really sucks is that if you breathe in a radon atom and it decays in your lungs, it changes into a polonium atom while irratiating you. You probably can't get rid of the polonium atom (it's a metallic solid), and it is also radioactive. An atom of radon must undergo 8 radioactive decay events to get to a stable isotope of lead. That means if a radon atom you inhale decays, you get that shot of radiation, and you will probably get 7 more shots of radiation - in the same general location - before things are over. Lots of biological damage can occur. And these decay events involve some very damaging particulate radiation (alpha and beta radiation). It's about the worst of the worst.
What does radon decay into?
222Rn is the only natural isotope of radon. (Several other artificial isotopes are known, but about the only place they exist is in the physics lab. Let's work with the natural one.) This isotope is itself the daughter of 226Radium, by the way. (226Ra had to decay to create 222Rn.) The decay scheme for radon is as follows:
222Rn will alpha decay (half life of 3.8 days) into 218Po
218Po will alpha decay (half life of 3.1 minutes) into 214Pb
214Pb will beta decay (half life of 27 minutes) into 214Bi
214Bi will beta decay (half life of 20 minutes) into 214Po
214Po will alpha decay (half life of 160 microseconds) into 210Pb
210Pb will beta decay (half life of 22 years) into 210Bi
210Bi will beta decay (half life of 5 days) into 210Po
210Po will alpha decay (half life of 138 days) into 206Pb (stable)
In case it isn't obvious, radon and its daughters are all radioactive and pose a hazard. (Save lead, 206Pb, the final daughter.) And because radon is a gas and is inert, it travels around in the air and can be inhaled. And an airborne radionuclide is harder to defend against and contain than a liquid or solid one. Radon is suspected of accounting for a high percentage of lung cancer deaths since exposure to radiation can cause cancer.
What really sucks is that if you breathe in a radon atom and it decays in your lungs, it changes into a polonium atom while irratiating you. You probably can't get rid of the polonium atom (it's a metallic solid), and it is also radioactive. An atom of radon must undergo 8 radioactive decay events to get to a stable isotope of lead. That means if a radon atom you inhale decays, you get that shot of radiation, and you will probably get 7 more shots of radiation - in the same general location - before things are over. Lots of biological damage can occur. And these decay events involve some very damaging particulate radiation (alpha and beta radiation). It's about the worst of the worst.
上面的大意是：
自然的氡同位素原子量是222（是空气平均重量的8倍，一般情况下极其不易排放到室外）。氡气（氡原子）是放射性的。
。。。。。。
让人无比头疼的是，如果你呼吸入一个氡原子，它在你的肺中衰变，它首先衰变成一个钋原子，而刺激毁坏你。你可能无法摆脱钋原子（它是一种固态重金属），而且它也具有放射性。
一个氡原子一定要经过8次衰变才能成为稳定的铅同位数。这就意味着：如果你吸入的一个氡气原子衰变了，你将会挨那辐射的一枪，并且你非常可能还要承受那7 次辐射--在同一个位置--在这一切结束之前。这期间可以发生严重的生物性的损伤。而这些衰变事件涉及到一些非常有害的微粒辐射（α和β辐射）。这是差中 之差，坏中之坏！
自然的氡同位素原子量是222（是空气平均重量的8倍，一般情况下极其不易排放到室外）。氡气（氡原子）是放射性的。
。。。。。。
让人无比头疼的是，如果你呼吸入一个氡原子，它在你的肺中衰变，它首先衰变成一个钋原子，而刺激毁坏你。你可能无法摆脱钋原子（它是一种固态重金属），而且它也具有放射性。
一个氡原子一定要经过8次衰变才能成为稳定的铅同位数。这就意味着：如果你吸入的一个氡气原子衰变了，你将会挨那辐射的一枪，并且你非常可能还要承受那7 次辐射--在同一个位置--在这一切结束之前。这期间可以发生严重的生物性的损伤。而这些衰变事件涉及到一些非常有害的微粒辐射（α和β辐射）。这是差中 之差，坏中之坏！
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冬天因为无法打开门窗，暖气一工作，就会有一部分的氡气带到了楼上，包括卧室。
夏天，一楼二楼开窗，基本没有问题。但地下室的氡气还是无法或者很少能排出去，因为氡气非常重。
在没有安装减排系统前，少去地下室有点作用。
