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

I C  Okeyode and A O  Akanni

doi:10.17485/ijst/2009/v2i7.4

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

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2009/v2i7.4

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

Original Article

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

I.C. Okeyode and A.O. Akanni

Department of Physics, College of Natural Sciences, University of Agriculture, Abeokuta, Nigeria

*Author for the correspondence:
A.O. Akanni
Department of Physics, College of Natural Sciences,
University of Agriculture, Abeokuta, Nigeria
E-mail: [email protected]

This work is licensed under a Creative Commons Attribution 4.0 International License.

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 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