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

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In addition, care should be taken to assure that the fan does not discharge into occupied areas. 1 Subsoil Collection Systems. To be effective, a subsoil collection system must produce slightly sub-atmospheric pressures in the soil adjacent to each wall and the floor of a building. An approach is to install perforated pipe beneath the basement floor or slab and in excavated trenches surrounding the building. If such piping is then coupled to an exhaust system (either a fan or a passively vented stack) to provide the pressure differential necessary to prevent the radon from the soil entering the building, proper protection can be assured.

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. 5 per hour. Approximately one-half of the PAEC reduction could be attributed to turbulent plateout on walls in the room and inside the fan blower units. Both investigators found that the fraction of unattached airborne radon decay products significantly increased (30 to 60 percent) after air treatment.

C) The increase in pressure within the building decreases the inflow of soil gas. The effect of this reduction in radon supply rate on the concentrations within the building can be much larger than the change in ventilation rate. Similarly, an exhaust fan increases the building-soil pressure differential, and can increase the radon infiltration rate (supply) enough to more than compensate for the increased ventilation rate. Changes in the radon supply rate can lead to changes in radon concentrations much larger than those caused by ventilation rate changes.

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