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Determination of some Physical Parameters of Olumo Rock, Abeokuta Ogun-state, Nigeria


Affiliations
1 Department of Physics, College of Natural Sciences, University of Agriculture, Abeokuta, 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
User

  • Adams F and Dams R (1975) Applied Gamma ray Spectrometry, Pregman Press. pp: 53, 417-420.

  • Ajayi IR, Oresegun MO and Babalola IA (1996) Absorbed Dose Rates in air due to U,Th and K in a part of South-Western Nigeria. Nig. J. Phys. 8C, 38-40.

  • Babalola IA (1984) Radiation measurements and assay of tailings from high natural radioactivity in

  • Plateau State. Nig. J. Sci. 18, 98-101.

  • Beck HL, Decompo J and Gologak J (1972) In – Situ Ge (Li) and NaI (Tl) gamma –ray spectrometry. Health & Safety Lab., U.S. Atomic Energy Commission Report 258.

  • Birch F (1954) Heat from radioactivity. In: Nuclear Geology.: Faul H (Ed.) John Wiley & Sons, New York.

  • Essentials on Geophysical Research (2005) Lecture Notes Series, MIT, pp: 18 -23.

  • Farai IP and Jibril NN (2000) Baseline Studies of Terrestrial Outdoor Gamma Dose rate levels in Nigeria. Rad. Protection Dosimetry. 88 (3), 247-254.

  • Green AES (1955) Nuclear Physics. McGraw- Hill, New York.

  • Muncaster R (1985) A Level Physics. Heinmann Education Press. pp: 40 – 42.

  • NCRP (1987) Exposure of the population in theUnited States and Canada from natural background radiation. NCRP Report 94. Bethesda, MD.

  • Nubi O (2006) Determination of radiogenic heat from some bore-holes in Ibadan, South-Western Nigeria (Unpublished B.Sc. Project submitted to Olabisi Onabanjo University, Ago-Iwoye, Ogun-State, Nigeria.

  • Ogunremi TJ (Unpublished Thesis) (1981) History of Olumo rock. pp: 1-7.

  • Okeyode IC, Farai IP (2007) Activity concentrations of natural radionuclides in the top soil of International Institute of Tropical Agriculture (IITA), Ibadan, bygamma-ray spectrometry. J. Radiol. Prot. 27, 333-347.

  • Olomo JB, Akinloye MK and Balogun FA (1994) Distribution of gamma – emitting natural radionuclides in soils and water around nuclear research establishments, Ile – Ife, Nigeria. Nuc. Instruments & Methods in Phys. Res. Sec. A. 353, 553-557.

  • Oresegun MO and Babalola IA(1990) Occupational radiation exposure associated with milling of Th-U rich Sn in Nigeria. Health Physics. 58, 213 – 215.

  • Sanni AO, James D and Schweikert EA (1985) Radioactivity of the by-products of Tin mining in Nigeria. Nig. J. Sci. 20, 115-120.

  • UNSCEAR (1993) Sources and effects of ionizing radiation. New York.


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  • Determination of some Physical Parameters of Olumo Rock, Abeokuta Ogun-state, Nigeria

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Authors

I. C. Okeyode
Department of Physics, College of Natural Sciences, University of Agriculture, Abeokuta, Nigeria
A. O. Akanni
Department of Physics, College of Natural Sciences, University of Agriculture, Abeokuta, Nigeria

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

References





DOI: https://doi.org/10.17485/ijst%2F2009%2Fv2i7%2F29489