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The purpose of this radiation shelter is to provide protection for 10 persons from the effects of radioactive fall out at a location near but separate from a residence or other nearby buildings. The principal advantage of this shelter is that it can be erected without excavation in locations where there is poor drainage or where the ground water table is close to the surface. However, this shelter is not a low-cost structure. But if you’re willing to spend for the protection of your family, this shouldn’t be an issue. You have to check out this illustrated guide.
Space and Occupancy
This shelter provides almost 150 square feet of area and approximately 640 cubic feet of space. Although only a small portion of this area provides sufficient headroom for standing erect, practically the entire area can serve as sitdown space for 10 persons and storage space for supplies.
Availability and Cost of Materials
The pressure-treated lumber which is required is generally available at retail lumberyards. In certain areas it may be necessary to allow time for the treated lumber to be ordered and transported from stock at other locations. The estimated cost of materials is $550.
Fall Out Protection Factor
The recommended minimum earth cover of 2 feet with an entranceway and door shielded by a 2-foot thickness of sandbags, and the rear wall mounded will provide a protection factor of about 500.
While the basic function of this radiation shelter is fall out protection, limited blast resistance of about 5 pounds per square inch of overpressure would be afforded by the heavy wood structure. The blast resistance would vary somewhat with the workmanship and materials but the laminated design tends to offset variations.
Ducts for mechanical ventilation may be located in the ventspace over the doorway without involving structural change. Hand-operated ventilation equipment should be used.
After materials are delivered at the jobsite, 4 man-days should be allowed for erecting the structure. Earth covering would require 4 additional man-days, without the use of power equipment.
Structural Life Expectancy
The life expectancy of this shelter should be from 15 to 20 years.
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