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Radioactivity levels of U-238 and Th-232, the alpha and beta activities and associated dose rates from surface soil in Ulu Tiram, Malaysia

Ramli, Ahmad Termizi and Abdul Rahman, Ahmad Taufek (2007) Radioactivity levels of U-238 and Th-232, the alpha and beta activities and associated dose rates from surface soil in Ulu Tiram, Malaysia. Journal of Radioanalytical and Nuclear Chemistry, 237 (3). pp. 653-657. ISSN 0236-5731

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Official URL: http://dx.doi.org/10.1007/s10967-007-0926-2

Abstract

A survey was carried out to determine terrestrial gamma radiation dose rates, the concentration level of 238U and 232Th and a and ß activities for the surface soil in Ulu Tiram, Malaysia. A 125 measurements were performed using a NaI(Tl) gamma-ray detector with crystal size of 1 "x 1" on 15 soil samples collected from the site area about 102 km2. 238U and 232Th concentrations were determined in soils by using hyper pure germanium (HPGe) gamma-ray spectrometry. The activity of a and ß from the surface soil was counted by using alpha beta counting system. The average value of 238U and 232Th concentrations in soil samples collected are 3.63±0.39ppm within the range of 1.74±0.20 to 4.58±0.48 and 43.00±2.31 ppm within the range of 10.68±0.76 to 82.10±4.01 ppm, respectively. The average estimate of a and ß activity in soil samples collected are 0.65±0.09 Bq·g-1and 0.68±0.08 Bq·g-1, respectively. The average of terrestrial gamma-radiation dose rates measured in Ulu Tiram was found to be 200 nGy·h-1, within the range of 96 to 409 nGy·h-1, The population weighted outdoor annual effective dose was 1.2 mSv.

Item Type:Article
Uncontrolled Keywords:terrestrial gamma radiation, radiation 238U and 232Th
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:8803
Deposited By:INVALID USER
Deposited On:13 May 2009 03:57
Last Modified:13 May 2009 03:57

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