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Reduction of Radon Progeny in Indoor Air.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The effectiveness of using three different types of air treatment methods to reduce the concentrations of radon progeny in a residence was evaluated. The air treatment devices were two types of electrostatic precipitators that were designed for use with a whole house heating and cooling system and an ionization air cleaner that was designed for table-top use in a single room. The air treatment devices were tested in a 100 cubic meter chamber at typical radon gas concentrations of 12.5 to 20.5 picocuries per liter. The modified Tsivoglou method was used to determine radon progeny concentrations and a continuous monitor for radon concentration was in operation, allowing calculation of the equilibrium factor under non-constant radon conditions. Reduction in average working level measurements and reduction in equilibrium factor were used to evaluate the effectiveness of the air treatments. Radon progeny reductions of greater than 50 percent were observed for all three devices tested at air treatment rates that were comparable to those that would be used in a residence.
APPROVED FOR PUBLIC RELEASE