Control of Radon in Houses: Recommendations of the National by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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Extra info for Control of Radon in Houses: Recommendations of the National Council on Radiation Protection and Measurements (Ncrp Report ; No. 103)

Example text

They suggested that the observed variations in the removal efficiencies were attributable to insufficient mixing of air inside the apartment and to diurnal fluctuations in the radon concentrations. No measurements were performed for the unattached h c t i o n or condensation nuclei concentrations. Scott (19831, conducted field measurements in which he investigated the effectiveness of ESPs installed in the central air conditioning systems of several houses built over Florida phosphate lands with elevated radium content.

1987). 8 air exchanges per hour. Results from this study determined working level reductions of 67 and 85 percent for a negative and positive space charge, respectively. 10). This is attributable to less particle removal a t the higher exchange rates, which is believed 50 / 5. SOURCE INDEPENDENT CONTROL TECHNIQUES to be related to shorter particle charging times, greater particle entry rates and a decrease in ion concentration by ventilation losses. Despite less particle removal a t the higher infiltration rate, the PAEC reductions were not significantly different with the positive space charge.

The larger reductions were associated with low (less than 4000 per cubic centimeter) condensation nuclei concentrations and consequently enhanced plateout of unattached decay products. 5. Data on measurements df the effectiveness of electronic air cleaners in reducing airborne radon decay product concentrations have been published by Hinds et al. (1983), Maher (1985), and Rajala et al. (1986). All three investigations were conducted in a ventilated laboratory room under controlled environmental conditions using a free-standing, home-sized electrostatic precipitator.

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