Abstract
Assessment of natural background radionuclides emanating from the subsurface geological features was carried out with the use of gamma-ray spectrometry at various locations at one of the secondary school in Canaan land, Ota, Ogun State. The activity concentrations of 226Ra, 232Th and 40K were revealed to be 12.66 ± 0.76–42.33 ± 1.37, 44.96 ± 1.41–128.70 ± 1.56, 31.30 ± 1.18–453.85 ± 2.43 Bq kg−1 respectively. The mean value of 232Th reported higher than the world reference standard of 50 Bq kg−1. Moreover, the stations closest to the school’s laboratory were noticed to be prone to more gamma radiations than the other buildings in the school. Similarly, the results of the radiological parameters estimated varied between 86.04–243.7 Bq kg−1, 40.02–115.4 nGy h−1, 0.049–0.142 mSv y−1 and 0.232–0.658 for Raeq, D(out), AEDE and Hex, respectively. Although, the results of the radiological parameters did not exceed the world safe limits, higher values of these parameters were reported at some stations closer to the school laboratory. It can be concluded that the school laboratory is prone to more gamma radiation than the class rooms and the administrative block. Therefore, the laboratory instructors and staff, who spend longer time in the laboratory, are more liable to the health risk that could result from years of exposure to gamma radiation in the laboratory.
Highlights
Assessment of natural background radionuclides emanating from the subsurface geological features was carried out with the use of gamma-ray spectrometry at various locations at one of the secondary school in Canaan land, Ota, Ogun State
It was noted that the lowest value of activity concentration for 226Ra occurred at station 11, while the highest value was observed at station 22
The results of the radiological parameters estimated varied between 86.04–243.69 Bq kg−1, 40.02–115.35 nGy h−1, 0.049–0.142 mSv y−1 and 0.232–0.658 for radium activity equivalent, external absorbed dose rate, annual effective dose equivalent and external hazard index, respectively
Summary
Assessment of natural background radionuclides emanating from the subsurface geological features was carried out with the use of gamma-ray spectrometry at various locations at one of the secondary school in Canaan land, Ota, Ogun State. Humans are continually being exposed to radiation that is emitted from the environment because of the presence of r adionuclides[1,2] This is due to the naturally occurring radioactive materials present in the soil. This can pose as a serious hazard if they are present in high concentrations. This can seriously affect the health of the inhabitants of the community where the radiation is present[2,3,4]. The concentration of the naturally occurring radionuclides present in the soil can be influenced by man-made activities. Further information on the geology of the area of study is captured in22
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