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

Example text

1. 1 Routes of Soil Gas Entry. The observation that solid concrete was essentially impermeable to soil gas containing radon led naturally to the development ofmethods to seal the openings through which soil gas entered a structure. 2). 1). The basement floor is often poured late in the construction of a building's foundation, while the building supports, and supports and piping for the furnace, oil tank, and stairs are resting on the subfloor fill. As a result, the concrete beneath or around these areas often has 28 1 4.

1. 1 Routes of Soil Gas Entry. The observation that solid concrete was essentially impermeable to soil gas containing radon led naturally to the development ofmethods to seal the openings through which soil gas entered a structure. 2). 1). The basement floor is often poured late in the construction of a building's foundation, while the building supports, and supports and piping for the furnace, oil tank, and stairs are resting on the subfloor fill. As a result, the concrete beneath or around these areas often has 28 1 4.

The first strategy is direct introduction of fresh outside air. This not only dilutes the radon concentration in the crawl space, but it also slightly pressurizes the crawl space and reduces the emanation rate of radon from the soil. In cold climates, floors, sewices and heating ducts may have to be insulated. If this is not feasible due to limited access, the air may have to be heated. The high costs of a heater unit and of energy to power it makes this an unattractive approach. The second strategy is to exhaust air from the crawl space,creating a small negative pressure so that the normal flow of air is from the 38 1 4.

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