Radon Exposure & Dose
Estimate the annual effective dose from indoor radon based on concentration, occupancy and equilibrium factor, free online.
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Annual dose (mSv) ≈ C × F × T × 9 nSv per Bq·h/m³, where C is the radon concentration (Bq/m³), F the equilibrium factor (0.4 indoors) and T the hours spent there. The WHO reference level is 100 Bq/m³ and the US EPA action level 148 Bq/m³ (4 pCi/L). Test your home with a long-term detector.