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This lean to shelter is designed to provide low-cost protection from the effects of radioactive fall out. It is intended to be installed belowgrade in a basement area. Its principal advantages are availability of low-cost materials, adaptability to the dimensions of most basements, ease of construction, and it can be disassembled readily.
Space and Occupancy
The lean to shelter interior has over 40 square feet of area and over 120 cubic feet of space and will house three persons. Its length may be extended by adding sections.
Availability and Cost of Materials
Materials may be purchased from building materials retailers. Many of these have this shelter in kit form at a price of about $125. The entire kit is transportable in an average-sized station wagon and can be carried through standard-size doorways, hallways, and window openings.
Fall Out Protection Factor
The shelter is designed to provide a protection factor of at least 100 in most residences.
Although this shelter was designed primarily to provide fallout protection, it would also provide some protection from flying debris associated with blast.
Natural ventilation is obtained by omitting two sandbags from the top of the entranceway closure and by leaving a 1-inch airgap along the rear wall.
Total construction time is approximately 18 man-hours: 2 hours for construction of the shell and 16 hours for filling and stacking the sandbags.
Structural Life Expectancy
The range is from 10 to 20 years, depending on the level of humidity in the basement.
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