Soil samples were collected around the uranium deposit of Kitongo to determine activity concentrations of 238 U, 232 Th and 40 K using a NaI(Tl) detector. Ambient dose equivalent rates were measured using a survey meter. 222 Rn-220 Rn discriminative measurements were performed using passive type monitors. The activity concentrations of 238 U, 232 Th and 40 K ranged from 20±5 to 337±78 Bq kg −1 , 14±4 to 53±13 Bq kg −1 and from 21±4 to 897±190 Bq kg −1 respectively, with the average values of

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... 24, 27±4 and 592±125 Bq kg −1 , respectively. Ambient dose equivalent rates ranged from 0.05 µSv h −1 to 6.20 µSv h −1 . Higher values were recorded inside the two galleries of the uranium deposit. The maximum dose to prospective miners was calculated to be 15.2 mSv y −1 . In case of the miner staying permanently inside the galleries, the external dose received would vary from 32 to 54 mSv y −1 with an average of 43 mSv y −1 . Radon concentrations ranged from 416±13 to 523±14 Bq m −3 with the average value of 486±14 Bq m −3 . Occupational inhalation dose ranged from 2.8 to 3.5 mSv y −1 with an average value of 3.2 mSv y −1 .