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Indoor radon concentration measurements in some dwellings in four districts in Ghana have been monitored between 3months and 1 year using LR-115 type II Cellulose Nitrate films in the bare mode. The annual average indoor radon concentrations vary from 9.40±6.30 to 144±93.80 (Bqm− 3) in the bedrooms. Annual effective doses were calculated, using ICRP-65 conversion values, and the average annual effective dose varied from 0.25±0.08 to 4.33±0.47 mSv. Radon concentration levels and annual effective doses were found to be within recommended limits.