Email a copy of 'Radiation Protection Factors for Dummies - by L.H.' to a friend
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One way to reduce exposure to radiation is by distance but I have no idea how effective that is. Is the distance between the roof and the basement of a 2-story house enough to make much of a difference? I suspect not, but I don’t know.
Written 13 years ago, this entry is a great read and it covers a lot of the things I’ve been going over in my mind for over a year (i.e., I have a basement that is good, but needs a ceiling strategy).
I’ve thought of lightweight solutions like “filled waterbed liner on overhead above” but this is the first thing I’ve read that discusses such topics.
You said you’ve covered outside exposed area of basement walls with 10 halving layers (3 feet of dirt) and that gives you a PF of 100. Wouldn’t that give you a PF of 1024? So then you wouldn’t need additional shielding on the interior walls, just for the ceiling.