Abstract
Terrestrial radiations are natural types from radionuclides found in rocks, building materials and soils in an environment. Monitoring of background radiation energy levels in selected school in Ota, Ogun State Nigeria by direct measurement of terrestrial radiation dose rate was done. The mean dose rate ranged from 35.4 to 62.34 nGyh−1. The measured mean values are within world average recommended limits of 59 nGyh−1 except for study location SC7 with mean dose rate value of 62.34 nGyh−1. On the over all, it can be concluded that the concentration of NORM (naturally occurring radioactive materials) and radiation dose rate in an environment is at safe level. Further environmental radiation assessment is recommended to ascertain the possible sources of background radiation dose rate and exposure, beside terrestrial radiation sources.
Highlights
Terrestrial radiations are natural types from radionuclides found in rocks, building materials and soils in an environment
The measured mean values are within world average recommended limits of 59 nGyh-1 except for study location SC7 with mean dose rate value of 62.34 nGyh-1
It can be concluded that the concentration of NORM and radiation dose rate in an environment is at safe level
Summary
Terrestrial radiations are natural types from radionuclides found in rocks, building materials and soils in an environment. The geological formation of an area, makeup the earth crust, determines the radionuclide concentration that influences the background radiation level of the area. Research findings have it that radiation dose from NORMs makeup over 85% of the total dose that gets to man and 15% comes from artificial sources [1, 2, 3, 4]. Of concern in this study is the monitoring of background radiation concentration levels in selected school by direct measurement of terrestrial radiation dose rate and radionuclide heads such as Thorium-232, Uranium-238 and Potassium-40. 2018, worked on background radiation monitoring in industrial area of Ota town, the mean dose rate of the finding is presented in figure 1, the study concluded that the industrial areas of Ota environ is safe for dwellers [5]
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