Ramli, Ahmad Termizi and Hussein, A. Wahab M.A. and Wood, A. Khalik (2005) Environmental 238U and 232Th concentration measurements in an area of high level natural background radiation at Palong, Johor, Malaysia. Journal of Environmental Radioactivity, 80 (3). pp. 287-304.
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Official URL: http://dx.doi.org/10.1016/j.jenvrad.2004.06.008
Concentrations of uranium-238 and thorium-232 in soil, water, grass, moss and oil-palm fruit samples collected from an area of high background radiation were determined using neutron activation analysis (NAA). U-238 concentration in soil ranged from 4.9 mg kg-1 (58.8 Bq kg-1) to 40.4 mg kg-1 (484.8 Bq kg-1), Th-232 concentration ranged from 14.9 mg kg-1 (59.6 Bq kg-1) to 301.0 mg kg-1 (1204 Bq kg-1). The concentration of U-238 in grass samples ranged from below the detection limit to 0.076 mg kg-1 (912 mBq kg -1), and Th-232 ranged from 0.008 mg kg-1 (32 mBq kg -1) to 0.343 mg kg-1 (1.372 Bq kg-1). U-238 content in water samples ranged from 0.33 mg kg-1 (4.0 Bq L -1) to 1.40 mg kg-1 (16.8 Bq L-1), and Th-232 ranged from 0.19 mg kg-1 (0.76 Bq L-1) to 0.66 mg kg -1 (2.64 Bq L-1). It can be said that the concentrations of environmental U-238 and Th-232 in grass and water samples in the study area are insignificant. Mosses were found to be possible bio-radiological indicators due to their high absorption of the heavy radioelements from the environment.
|Uncontrolled Keywords:||Activity concentration, environmental, radiation, soil, thorium-232, uranium-238|
|Subjects:||Q Science > QC Physics|
|Deposited By:||Maznira Sylvia Azra Mansor|
|Deposited On:||09 Jan 2009 08:28|
|Last Modified:||09 Jan 2009 08:35|
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