一晚上氡气检测出69

[shimh]

为什么我的short term永远显示1天呢？这个short term的日子会不会变啊？说明书上说1-7天

机器背后电池盖上面有两个点，找个笔之类的按右边那个点，可以切换1天/7天。说明书上有，读一下吧。

 

[jy]

你那是每天的读数吗？我那东西Short term是3天，Long term是30天，没法看到一天读数，除非天天Reset

 

[Fetion]

有兴趣的可以读读这个研究报告，有氡气衰变过程，可能致病原理，有对EPA的怀疑与挑战，也给出一些mitigation的方法。特别有意思的是SLRD(short lived radon daughter)的描述，以及基于SLRD plate-out 原理的简单实用 mitigation方法。http://www.forensic-applications.com/radon/radon.html

 

[monami]

目前加拿大标准是200Bq/m3. 如果按照此标准呼吸12小时每天, 一年也相当于照30 次X 光。由于氡气半衰期只有不到4天, 衰变后都为非气体重放射性元素(多数半衰期短）, 这些元素才是辐射危害的主力部队。如果呆在肺部就会造成长期辐射。在室内, 他们多沉降在地面, 特别是地下室。因此即使你的室内读数可能不高，保持对地下室的定期吸尘(建议戴口罩吸尘)比较重要, 这一点常常被人忽视。

 

[shimh]

氡气危害可比烟大的多，不止会造成肺癌，啥癌都可能，因为氡是放射性的无色无味气体，烟没有放射性。

氡气基本只和肺癌有关，因为身体其他部位有皮肤，足以抵抗alpha粒子。氡气比烟还是差一点：

Health Canada reports radon exposure is linked to 16 per cent of lung cancer deaths and is the second leading cause of lung cancer after smoking.

http://thechronicleherald.ca/homesnews/1324591-understanding-radon

 

[jy]

目前加拿大标准是200Bq/m3. 如果按照此标准呼吸12小时每天, 一年也相当于照30 次X 光。由于氡气半衰期只有不到4天, 衰变后都为非气体重放射性元素(多数半衰期短）, 这些元素才是辐射危害的主力部队。如果呆在肺部就会造成长期辐射。在室内, 他们多沉降在地面, 特别是地下室。因此即使你的室内读数可能不高，保持对地下室的定期吸尘(建议戴口罩吸尘)比较重要, 这一点常常被人忽视。

你是说衰变后变成固体?并且这些固体还要继续衰变, 而且产生辐射更多?

 

[shimh]

你是说衰变后变成固体?并且这些固体还要继续衰变, 而且产生辐射更多?

Here's the process:

• Radon (Rn222) does an alpha decay into Polonium (Po218) with a half life of 3.824 days.
• Polonium (Po218) does an alpha decay into Lead (Pb214) with a half life of 3.05 minutes.
• Lead (Pb214) does a beta decay into Bismuth (Bi214) with a half life of 26.8 minutes.
• Bismuth (Bi214) does a beta decay into Polonium (Po214) with a half life of 19.8 minutes
• Polonium (Po214) does an alpha decay into Lead (Pb210) with a half life of 164 microseconds.
• Lead (Pb210) does a beta decay into Bismuth (Bi210) with a half life of 22.3 years.
• Bismuth (Bi210) does a beta decay into Polonium (Po210) with a half life of 5.01 days.
• Polonium (Po210) does an alpha decay into Lead (Pb206) with a half life of 138.38 days.
• Lead (Pb206) is stable.

http://www.blackcatsystems.com/GM/experiments/ex1.html

 

[jy]

Here's the process:

• Radon (Rn222) does an alpha decay into Polonium (Po218) with a half life of 3.824 days.
• Polonium (Po218) does an alpha decay into Lead (Pb214) with a half life of 3.05 minutes.
• Lead (Pb214) does a beta decay into Bismuth (Bi214) with a half life of 26.8 minutes.
• Bismuth (Bi214) does a beta decay into Polonium (Po214) with a half life of 19.8 minutes
• Polonium (Po214) does an alpha decay into Lead (Pb210) with a half life of 164 microseconds.
• Lead (Pb210) does a beta decay into Bismuth (Bi210) with a half life of 22.3 years.
• Bismuth (Bi210) does a beta decay into Polonium (Po210) with a half life of 5.01 days.
• Polonium (Po210) does an alpha decay into Lead (Pb206) with a half life of 138.38 days.
• Lead (Pb206) is stable.

http://www.blackcatsystems.com/GM/experiments/ex1.html

明白了，要扫掉所有原子量为210的东西。其它的半衰期太短，放射过程一会儿就完成了。

 

[2015]

http://www.hc-sc.gc.ca/ewh-semt/radiation/radon/faq_fq-eng.php
"Radon is a radioactive gas that is formed naturally by the breakdown of uranium..... Radon gas breaks down further to form additional radioactive particles called radon daughters, or "progeny" that can be breathed into the lungs.

很好, 接着读, 把那里的FAQ都读完你就明白了 ...

 

[冷笑9声]

第3天读数121，问题严重了。

操心啊？ 看来这玩具还真得长备着。

 

[Anakin]

这意思不打算往外租了？

第3天读数121，问题严重了。

 

[一亩三分地]

这意思不打算往外租了？

不愿意造福百姓的木匠不是好人民

 

[Patio]

今天读数160了，Basement不敢下去了。

 

[冷笑9声]

今天读数160了，Basement不敢下去了。

买了块心病啊？

 

[urus]

今天读数160了，Basement不敢下去了。

furnace 和 HRV上的风扇开了吗？