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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1981

Title: Indoor Gamma Ray Measurements, Activity Concentrations and Radiation Hazard Assessment of Residential Mud Buildings in Miango, North Central Nigeria.
Authors: Solomon, Abiye Olatunji
Chagok, Nestor Monday
Ashano, Edafetano Chris
Ogunleye, Paul Olusegun
Otebe, Igah Sabastine
Rimven, Bitrus Nansak
Keywords: Uranium
Absorbed dose rate in air
Annual effective dose equivalent
Radium equivalent activity
Excess lifetime cancer risk
Internal hazard index
Issue Date: 2018
Publisher: Journal of Natural Sciences Research (IISTE)
Series/Report no.: Vol. 8;No. 6; Pp 91 -100
Abstract: Natural radioactivity levels and radiation risks from mud buildings in Miango, North Central Nigeria have been assessed. The town is located within Naraguta Sheet 168 NW. The area is underlain mainly by porphyritic Pan- African granites, Mesozoic anarogenic Younger Granite consisting of biotite granite and granite porphyry, and newer basalt. Weathering and decomposition of these rocks have produced thick layers of clayey soils (mud) which are used for building residential houses. Concentrations of ²³⁸U, ²³²Th and ⁴⁰K in the mud houses were determined using RS-230 Gamma Spectrometer integrated with a BGO (Bismuth Germanate Oxide) detector for improved accuracy. The content of ²³⁸U, ²³²Th and ⁴⁰K in the mud houses varies from 3.77-10.77ppm, 27.08- 73.77ppm, and 1.47–6.27% respectively. Activity concentrations of these radioelements vary from 46.52-132.97 Bq/Kg for ²³⁸U, 109.76-299.49 Bq/Kg for ²³²Th, and 459.07-1961.47 Bq/Kg for ⁴⁰K. On the basis of these activity concentrations, radiation exposure parameters such as absorbed dose rate in air, annual effective dose equivalent, radium equivalent activity, excess lifetime cancer risk, and internal hazard index were calculated for the buildings. Results obtained vary from 146.79-291.69 nGy/h, 0.68-1.34 mSv/yr, 322.49-642.26 Bk/kg, 2.36 x10⁻³- 4.70 x10⁻³, and 1.00-2.08 respectively. These values are generally high for safety, thus suggesting that there is a good chance that using the clayey soils from this area for building houses may have negative health implications on the inhabitants in the long term.
URI: http://hdl.handle.net/123456789/1981
ISSN: 2225-0921
Appears in Collections:Geology and Mining

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