Radon is formed as part of the normal radioactive decay chain of uranium. Uranium has been around since the earth was formed and its most common isotope has a very long half-life (4.5 billion years), which is the amount of time required for one-half of uranium to break down. Radon is a decay product of uranium, which is relatively common in the Earth's crust, but generally concentrated in ore-bearing rocks scattered around the world. Every square mile of surface soil, to a depth of 6 inches (2.6
【在 y*******e 的大作中提到】 : 为什么会有氡气呢?
P*s
15 楼
她是长得挺顺眼的。
【在 M********c 的大作中提到】 : 这个妹妹也被另一组送过花。
e*7
16 楼
It was the long weekend with holiday. You may want to give them a few more days until the end of this week.
S*y
17 楼
No problem. It's a small case. Just install a mitigation system @ about $1k. Radon won't affect your yard, since it is an open area. Make sure the mitigation fan work, and open your windows and door to exchange the air (if not cold).