I ask because when I purchased my home the level was 19 pCi/L, and on a recent retest it is 27.8 pCi/L. I plan on for sure getting this fixed within a month, but I'm wondering if there's any reason to make it priority to get it done sooner. Most of the statistics, etc. on the danger talk about the effects over a lifetime, how much radon would it take for there to be an immediate danger to be living in the house?
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According to this Radon Dose Calculator, if you are exposed to 30 pCi/L the dose rate is 6.275 µSv/h. Multiply by 30 days and 24 hrs/day to get 4500 µSv, or 4.5 mSv dose over 30 days.
Wikipedia suggests that is similar a CT scan (which is a significant dose). You are probably not in the house 24 hours a day so you could adjust the numbers downward.
Here's another nice visualization of different doses.
JayL
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