你听说过氡气吗？如果没有，请看以下的链接。
http://zh.wikipedia.org/wiki/氡
氡（英语：Radon）是一种化学元素，化学符号Rn，原子序数86，为無色、無嗅、無味的惰性气体，具放射性。
因为它的放射性，氡气偏高是非常不好的，会危害家人的身体健康。特别是有小孩的家庭，因为它对小孩的危害会更加显著。但在测试以前，渥太华没有一栋房子可以保证没有氡气问题。
我可以帮你测试氡气，上门服务（现在只限西面），测试结果需要至少48小时。 您想测试的话，请悄悄话你的电话号码和地址给我。
如果需要控制和降低室内氡气含量，我可以优惠提供安装氡气整治系统。装完后，再帮你测试一星期以上，保证安装质量。这些测试全部免费。
如果测试结果是正常的，或不需要后续服务，收费$35。
http://zh.wikipedia.org/wiki/氡
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.
http://zh.wikipedia.org/wiki/氡
http://zh.wikipedia.org/wiki/氡
氡（英语：Radon）是一种化学元素，化学符号Rn，原子序数86，为無色、無嗅、無味的惰性气体，具放射性。
因为它的放射性，氡气偏高是非常不好的，会危害家人的身体健康。特别是有小孩的家庭，因为它对小孩的危害会更加显著。但在测试以前，渥太华没有一栋房子可以保证没有氡气问题。
我可以帮你测试氡气，上门服务（现在只限西面），测试结果需要至少48小时。 您想测试的话，请悄悄话你的电话号码和地址给我。
如果需要控制和降低室内氡气含量，我可以优惠提供安装氡气整治系统。装完后，再帮你测试一星期以上，保证安装质量。这些测试全部免费。
如果测试结果是正常的，或不需要后续服务，收费$35。
http://zh.wikipedia.org/wiki/氡
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.
http://zh.wikipedia.org/wiki/氡
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