International Research Journal of Pure and Applied Physics (IRJPAP)

EA Journals


Gamma Dose Rate, Annual Effective Dose and Collective Effective Dose of Food Crop Producing Region of Ondo State, Nigeria (Published)

The activity concentrations of natural gamma-emitting radionuclides 238U, 232Th and 40K in soils from 7 sampling sites in Ondo State, southwestern Nigeria have been measured by using a well calibrated high resolution gamma ray spectrometer. The mean activity concentration values of 39.24±1.12, 52.86±1.40 and 445.02±12.24 Bq kg-1 for 238U, 232Th and 40K respectively were obtained for the State. Absorbed dose rates in outdoor air were calculated to be in the range of 12.35±0.65 and 179.59±4.1 nGy h-1 with an overall mean value of 67.50±1.86 nGy h-1. The corresponding outdoor annual effective dose rates were estimated to be between 22.7 and 330.6 μSv y-1 for the area assuming 30% occupancy factors. The average outdoor annual effective dose rate for most of the towns is 64882.95 μSv y-1 representing 92.65% of the world average value (70000 μSv y-1) given by UNSCEAR. The value of the collective effective dose as calculated from the outdoor annual effective dose rates was found to be 540858 person-Sv

Keywords: Dose, Gamma, Outdoor, Radiation, Radionuclide

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