Abstract
Radiation exposures at various dumpsites around three cities located in southwest Nigeria were assessed by gamma ray spectroscopy using a highly shielded Canberra NaI (Tl) detector. The average activity concentrations obtained for 40K were 535 ± 65, 430 ± 78, 471 ± 72 and 410 ± 29, 270 ± 84, 371 ± 27 Bq kg−1; the mean concentrations of 226Ra were 66 ± 4, 47 ± 3, 11 ± 1 and 57 ± 10, 49 ± 13, 59 ± 17 Bq kg−1; while the mean concentrations of 232Th were 55 ± 19, 29 ± 8, 13 ± 2 and 29 ± 3, 21 ± 5, 41 ± 12 Bq kg−1 for designated and undesignated sites in Abeokuta, Akure and Osogbo respectively. The highest mean absorbed dose rate obtained was 86 ± 17 nGy h−1. The total excess lifetime cancer risk ranged from 1.28 to 3.22 × 10−3 which is relatively higher than the world average.
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