By National Council on Radiation Protection and Measurements

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

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These authors also noted that the ESP, itself, was a source of condensation nuclei when used in relatively clean air, presumably due to the production of ozone. The first reported measurements on the radon decay product removal efficiencies of ESPs in actual houses were performed by Lloyd and Mercer (1980) in a vacant apartment in Butte, Montana. 2 room volumes per hour. 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.

1979) demonstrated that fan induced plateout of radon decay products becomes negligible a t relative humidities greater than 80 percent. 4 AIR-CLEANINGDEVICES 1 45 about 60 percent. Many houses already have ceiling fans andlor central ventilation systems installed for heating and cooling purposes, and their operation is already reducing the airborne PAEC in those houses. One of the most attractive features of enhanced convection is that the PAEC reductions appear to be achieved with little or no change in the fraction of the total PAEC that is unattached.

These include buildings with concrete block foundations as well as those with poured concrete foundations. 1 34 / 4. SOURCE DEPENDENT CONTROL TECHNIQUES pressure differentials of 25 to 50 pascal in a pipe network. A passively vented stack extending into the low pressure zone over a roof produces a negative pressure of a few pascals, comparable to that existing between a building and the soil, since it is produced by the same wind and thermal forces. As the collection system must compete with the building for soil gas, a passive system will always need a much larger and hence more costly collection system than would a powered exhaust.

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