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| OLUMO ROCK |
Abeokuta Olumo Rock : Olumo Rock is a mountain in south western Nigeria. It is located in the Megacity, Abeokuta, Ogun State, Nigeria and was normally used as a natural fortress during inter-tribal warfare in the 19th century. Its patron spirit is venerated in the Yoruba religion as an orisha. The name olumo is the combination of two words Join together "olu" which means god deity, and "mo" which means moulded.
The history of the rock goes back to the Oyo Empire in the nineteenth century, when the Egba people who lived in Abeokuta sought safety in the Olumo rock amid inter-tribal conflicts.
The rock served as both a vantage point to see the enemy's march and a tower of strength for the Egba people in their efforts to protect the new town, ultimately resulting to victory in There battle.
Abeokuta Olumo Rock Full Measurement
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.
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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 . 40 K, 238 U and 232 Th.
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