Distribution of natural radioactivity in rocks from Ikogosi-Ekiti, Southwestern Nigeria and its radiological implications.
The natural radioactivity in some rock samples in Ikogosi-Ekiti, Southwestern Nigeria, has been measured using a very sensitive gamma spectroscopic system consisting of a 76 mm x 76 mm NaI(TI) scintillation detector system coupled to a versatile Canberra Series 10 plus multichannel analyzer. The average concentrations of natural radioisotopes 238U, 232Th, and 40K are 57.9 +/- 28.1 Bq kg-1, 81.6 +/- 23.8 Bq kg(-1) and 1203.1 +/- 687.2 Bq kg(-1), respectively. These average values give rise to a mean absorbed dose rate of 0.128 +/- 0.051, microGy h(-1) at a height of 1.0 m and an effective dose equivalent of 156.90 microSv (y-1). The results indicate no radiological anomaly. The data presented here will serve as a baseline survey for primordial radionuclide concentrations in rocks of the area.
Ajayi
O S
OS
Department of Physics, Federal University of Technology, Akure Ondo State, Nigeria.
D001417:Background Radiation; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D005720:Gamma Rays; D008903:Minerals / Q000032:analysis*; D009549:Nigeria; D011197:Potassium Radioisotopes / Q000032:analysis; D011874:Radiometry; D012016:Reference Values; D012588:Scintillation Counting; D012680:Sensitivity and Specificity; D013051:Spectrometry, Gamma; D013910:Thorium / Q000032:analysis; D014501:Uranium / Q000032:analysis
D008903:Minerals; D011197:Potassium Radioisotopes; D014501:Uranium; D013910:Thorium