Introduction to Radon & Health Risk
The Fundamentals of Radon & Radioactivity
Radon Occurrence & Behavior
Radon Measurement & Devices
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Daily and Seasonal Variations in Radon Concentrations

The amount of radon entering the building depends on the factors discussed in the previous sections on radon source, transport, and entry. Due to the number of variables dependent on environmental conditions (pressure differentials and soil gas concentrations depend on wind speed and direction, indoor/outdoor temperature differential, recent rainfall, and operation of mechanical equipment), indoor radon concentrations vary over time. Figure 3 – 22 illustrates normal fluctuations in a home over a period of several days.

Figure 3-22
Normal Radon Fluctuations over Several Days