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This study examined the natural radioactivity due to 226 Ra, 232 Th and 40 K and radiation dose of new university campus, Dennis Osadebay University (DOU), in Asaba, southern part of Nigeria. Measured activity concentrations of radionuclides in soil showed a normal distribution and were ranged from 20.98 to 159.81 (73.32±31.11) Bq/kg for 226 Ra, 26.7 to 95.07 (58.38±16.04) Bq/kg for 232 Th and 108.33 to 316.44 (224.89±51.79) Bq/kg for 40 K. While the average concentrations of 40 K were about 1.5 times lower than the world average with 63% contribution to the total radioactivity content of the soil, the concentrations of 226 Ra and 232 Th were 2.2 and 1.3 times higher than the global average with about 21% and 16% contribution. The average radiation absorbed dose (78.51 nGy/h) and annual effective dose (0.10 mSv/y) exceeded global average of 59.0 nGy/h and 0.07 mSv/y respectively. Based on this and other radiological indices, the soil natural radiation is above that of normal background radiation level with potential radiological threat to the university community and general public.
Nwabuoku et al. (2026) studied this question.