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Soil gas radon and indoor radon measurements have been carried out in Mayo-Louti and Benoué Divisions in northern Cameroon. Concentrations of radon in soil have been measured using Markus 10 at the depth of about 1 m. Radon concentration in soil varies from 0.9 to 13.8 kBq m −3  with a mean value of 4.6 kBq m −3 . Average daily indoor radon concentrations measured with RadonEye+ 2  detectors vary from 7 to 60 Bq m −3  with an average of 17 Bq m −3 . Indoor radon concentrations measured with passive RADTRAK detectors range between 15 and 104 Bq m −3  with a geometric value of 38 Bq m −3  and a geometric standard deviation of 1.5. This geometric value is lower than the value of 30 Bq m –3  given by UNSCEAR. Indoor radon inhalation dose ranges between 0.28 and 1.97 mSv a −1  with geometric value of 0.72 mSv a −1  (at 0.03 standard deviation). Outdoor radon inhalation ranges between 0.02 and 0.26 mSv a −1  with a mean value of 0.09 mSv a −1 . The total annual effective dose due to indoor and outdoor radon exposure for this study area is 0.81 mSv a −1 , less than 1.15 mSv a −1  the world average value given by UNSCEAR. There is no significant radiological risk for the inhabitants.

Soil gas radon, indoor radon and its diurnal variation in the northern region of Cameroon