![]() ![]() The "PF" above the box stands for "Protection Factor." Before going into the details of what your "Protection Factor" numbers mean, let's talk for a moment about what fallout is. Information on the box labeled "Added Weight", is on page 20 of this booklet. On the back cover of this booklet a box like this appears:Įntered in the space labeled Basement "PF" are two numbers which tell you the fallout protection that was calculated for the "center" of your basement and the "best corner" of your basement. But first of all, because your home has a basement you already have some fallout protection. It will tell you what radioactive fallout is and how you can improve your protection against it if this country were ever attacked with nuclear weapons. This booklet is about fallout protection.
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