To qualify as a "blast-resistant shelter" a structure must be capable of withstanding an overpressure of not less than thirty pounds per square inch, which pressure would occur at a range of approximately two and one-half miles from a ten megaton, and approximately five miles from a one hundred megaton explosion. (4) Blast-resistant or limited blast-resistant shelter: A structure which qualifies as a fallout shelter and, in addition, is capable of affording a certain minimum amount of protection against the effects of a blast overpressure and associated nuclear and thermal radiation. ![]() A structure which has a protection factor of one hundred must offer a person at least one hundred times more protection against radiation than such person would have if unprotected. (3) Protection factor: The relative reduction in the amount of radiation that would be received by a person in a shelter compared with the amount which he would receive if unprotected. (2) Fallout shelter: A structure which, when properly installed, has a protection factor against fallout gamma radiation of not less than one hundred. (1) Shelter: A fallout shelter, a blast-resistant shelter, or a limited blast-resistant shelter. For the purposes of this Section, the terms defined herein shall have the respective meanings hereinafter set forth.
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