Activity concentration of naturally occurring radionuclides in soil from Oredo oil field in Benin city, Edo State Nigeria have been measured using gamma-ray spectroscopy. A total of sixty-four samples were collected in the field. The range of average activity concentration of 226Ra, 232Th and 40K were found to be 3.80 to 16.28 Bq kg-1, 11.69 to 62.48 Bq kg-1 and 47.75 to 406.42 Bq kg-1 respectively. The average absorbed dose rates ranged from 17.50 to 51.33 nGy h-1 with an overall mean of 46.75 nGy h-1, while the average annual effective dose rates ranged from 21.46 to 62. 92 μSv y-1 with an overall mean of 46.30 μSv y-1. The overall average of external hazard index was 0.22. All the samples have radium equivalent activities lower than the limit (370 Bq kg-1) set by UNSCEAR. The overall average annual gonadal dose associated with the field does not exceed permissible levels by UNSCEAR.
