• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2009, Volume: 2, Issue: 7, Pages: 6-10

Original Article

Determination of some physical parameters of Olumo rock, Abeokuta Ogun-State, Nigeria.


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 40K, 238U and 232Th. 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 40K 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 109 years. The average density was found to be 0,729 kgm-3.

Keywords: Olumo rock age, radioactivity, radionuclides, 40K, 238U and 232Th


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