Thanks a lot! I like to live in basement, so I'll sure check this.
Cobra 发表于 2010-8-16 11:53
Cobra LD, just a side-info about Radon: the 'allowed' radon level is very different. In most states in US, it is 4 pCi/l (pico curies per liter). In Canada, it is 400 Bq m3 (about 10 pCi/l).