Background Radiation from 238U, 232Th, and 40K in Bells Area and Canaan City, Ota, Nigeria

M. R. Usikalu; C. A.  Enemuwe; R. O. Morakinyo; M. M. Orosun; T. A. Adagunodo; J. A. Achuka

doi:10.3889/oamjms.2020.5434

Authors

M. R. Usikalu Department of Physics, Covenant University, Ota, Ogun State, Nigeria
C. A. Enemuwe Department of Physics, Covenant University, Ota, Ogun State, Nigeria
R. O. Morakinyo Department of Physics, Covenant University, Ota, Ogun State, Nigeria
M. M. Orosun Department of Physics, University of Ilorin, Ilorin, Kwara State, Nigeria
T. A. Adagunodo Department of Physics, Covenant University, Ota, Ogun State, Nigeria
J. A. Achuka Department of Physics, Covenant University, Ota, Ogun State, Nigeria

DOI:

https://doi.org/10.3889/oamjms.2020.5434

Keywords:

Radioactivity, Radiation, Radiological Impacts, Residential areas, Ota

Abstract

Natural radionuclides are present in every constituent of the environment. Monitoring of environmental radionuclides is very vital to avoid exposure above the threshold limit. Due to this, the background radiation from ²³⁸U, ²³²Th, and ⁴⁰K of Bell University of Technology and Canaan Land City was determined from 20 sample points each in the two areas using RS230 Gamma Spectrometer. The mean activity concentration of ⁴⁰K, ²³⁸U, and ²³²Th for Bells University of Technology was 442.66 Bq/kg, 41.98 Bq/kg, and 48.35 Bq/Kg, respectively. In Canaan City, mean activity concentration of ⁴⁰K, ²³⁸U, and ²³²Th was 373.65 Bq/kg, 18.85 Bq/kg, and 67.22 Bq/kg, respectively. The mean absorbed dose rates recorded by the spectrometer directly were 70.03 nGy/h and 66.65 nGy/h, while that estimated from the activity concentration were 67.06 and 64.89 nGy/h for Bells University and Canaan City, respectively. The measured and estimated absorbed dose rates were higher than the safe limit of 57 nGy/h. The mean values of other radiological parameters estimated, except that of the gamma index and excess lifetime cancer risk were lower when compared to the recommended limit. It could be concluded that the possibility of suffering any radiation risk is low in these two areas, but there is possibility of cancer risk for someone that has stayed in the area for 70 years and above.

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