Introduction to Radon & Health Risk
The Fundamentals of Radon & Radioactivity
Radon Occurrence & Behavior
Radon Measurement & Devices
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Transport Mechanisms – Forces That Move Radon Through Soil & Rock

Radon movement from its source into a home is powered in one of four ways (Figure 3-6):

  1. Well Water (<1%).
  2. Diffusion from soil to indoor air (1-4%).
  3. Emanation from Building Materials (2-5%).
  4. Soil Gas to Indoor Air via Pressure Driven Airflow (85-90%).
Figure 3-6
Transport Mechanisms
Source: LBL/EPA