Abstract
The physical parameters of Olumo rocks namely, radiogenic heat, age of the rock, density and average absorbed dose rate were determined. The radioactive concentrations were also determined using gamma-ray spectrometry. The three natural radio nuclides examined in the rock samples were namely 40 K, 238 U and 232 Th. The average radioactive concentration in each of the radionuclides were 961.49 BqKg -1 , 9.57 BqKg -1 and 112.38 BqKg -1 respectively. The average absorbed dose rate was 0.059 ± 0.0043 µGh -1 similar to the world's average absorbed dose rate of 0.059 ± 0.0l2 µGh -1 as recommended for normal environment by UNSCEAR. The highest radiogenic heat was found in 40 K with 93.37% of the total. Furthermore, the approximate age of Olumo rock, as per the activity concentration, was found to be 4.94 x 10 9 years. The average density was found to be 0,729 kgm -3 .
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