Comparison of Activity Concentration of 238U, 232Th and 40K in Different Layers of Subsurface Structures in Dei-Dei and Kubwa, Abuja, Northcentral Nigeria

Maxwell, Omeje and Wagiran, Husin and Ibrahim, Noorddin and Siak, Kuan Lee and Sabri, Soheil (2013) Comparison of Activity Concentration of 238U, 232Th and 40K in Different Layers of Subsurface Structures in Dei-Dei and Kubwa, Abuja, Northcentral Nigeria. Radiation Physics and Chemistry, 91. pp. 70-80. ISSN 0969-806X

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Related URL: http://dx.doi.org/10.1016/j.radphyschem.2013.05.00...

Abstract

The study of activity concentration of 232Th, 238U and 40K of rock samples from site one (S1L1-S1L11, 70m) and site two (S2L1-S2L9, 60m) boreholes in Dei-Dei and Kubwa was presented and the first time in the region to be compared. Activity concentrations were analysed using a high resolution co-axial HPGe gamma ray spectrometer system. The activity concentration ranges in site one borehole were from 45±1 to 98±6Bqkg-1 for 232Th, from 18±2 to 37±4Bqkg-1 for 238U and from 254 ±32Bqkg-1 to 1195 ±151Bqkg-1 for 40K. The activity concentration ranges in site two borehole were from 32±3 to 84±7Bqkg-1 for 232Th, from 15±2 to 52±5Bqkg-1 for 238U and from 119±15 to 705±94 for 40KBqkg-1. Significantly higher concentration of 232Th and 238U occurs in samples collected from S1L7, S1L11 and S2L1 layers. These zones experienced granitic intrusions produced by denudation and tectonism. 40K in rock samples of S1L4 and S2L4 activity concentrations is close; it could be that biotite granitic intrusion that is inferred as the formation in that layer reflects the same activity of potassium in rock's radioactivity measurement. The area requires further investigation of soil geochemistry and activity concentration of radionuclides in groundwater.

Item Type: Article
Uncontrolled Keywords: Abuja; Activity concentration; Boreholes; Gamma ray spectroscopy; Geology
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
H Social Sciences > H Social Sciences (General)
Divisions: Faculty of Built Environment > Urban and Regional Planning
Depositing User: Norazreen Ismail
Date Deposited: 16 Nov 2014 03:33
Last Modified: 16 Nov 2014 03:33
URI: http://epublication.fab.utm.my/id/eprint/524

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