AIR-FILTER SHIELDING FOR EMERGENCY SHELTERS
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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Experiments were conducted to show which particle sizes of fallout falling from altitudes of 10,000 feet or more would be drawn into a typically protected shelter air intake. Results indicated that practically no particles over 60 microns in diameter would be captured. Some particles in the 30- to 60- micron-diameter size range were captured, and almost all particles below 30 microns in diameter were captured. Calculations made on two fallout-size distributions and three radioactivity levels indicate no significant hazard from material collected on the shelter air filters. Side-opening blast-closure devices, such as the AMF and OCD units, require additional protection to keep fallout from being captured by the high velocities at the inlet. Shelters close to atomic blasts are likely to be subject to dangerous amounts of all sizes of particles coming from lower altitudes. These shelters must have all intakes closed during the danger period.
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