Levels of natural radionuclides in some Nigerian cereals and tubers

The activities of radionuclides in the two major groups of foodstuff widely consumed in Nigeria have been determined. The 40K concentration range from 9.9 ± 3.6 Bq kg−1 to 298 ± 14 Bq kg−1 (av. 130 ± 8.12 Bq kg−1). 238U concentration range from 1.47 ± 0.91 Bq kg−1 to 39.5 ± 9.9 Bq kg−1 (av. 11.5 ± 3.86 Bq kg−1), and 232Th range from 3.50 ± 1.85 Bq kg−1 to 10.5 ± 2.13 Bq kg−1 (av. 6.78 ± 2.13 Bq kg−1). 137Cs was not detected in any of the foodstuffs analysed.