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Terrestrial gamma radiation dose rates (TGRD) from surface soil in Negeri Sembilan, Malaysia

Norbani, Nor Eliana and Abdullah Salim, Nazaratul Ashifa and Saat, Ahmad and Hamzah, Zaini and Ramli, Ahmad Termizi and Wan Idris, Wan Mohd. Rizlan and Jaafar, Mohd. Zuli and Bradley, David A. and Abdul Rahman, Ahmad Taufek (2014) Terrestrial gamma radiation dose rates (TGRD) from surface soil in Negeri Sembilan, Malaysia. Radiation Physics and Chemistry, 104 . pp. 112-117. ISSN 0969-806X

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Official URL: http://dx.doi.org/10.1016/j.radphyschem.2014.04.00...

Abstract

Baseline data on background radiation levels allows for future assessment of possible changes in natural radionuclide concentrations, either as a result of geological processes or radioactive contamination. We have measured terrestrial gamma radiation dose-rates (TGRD) from surface soils throughout accessible areas in the Peninsular Malaysia state of Negeri Sembilan (NS). Dose rate measurements were carried out using a Nal (TI) scintillation survey meter, encompassing 1708 locations, covering about 73% of the 6645 km2 of the land area in NS. This has allowed development of a TGRD contour map, plotted using WinSurf software. The range of measured TGRD was from 71 +/- 3 nGy/h up to 1000 +/- 11 nGy/h. The greatest measured TGRD was obtained in an area covered by soil types originating from igneous rock of granitic formations, while the least value of TGRD was observed in an area covered by limestone composed of calcite mineral, mostly found near river and coastal areas. Mean values of TGRD across the seven districts of NS ranged from 244 +/- 7 nGy/h to 458 +/- 13 nGy/h, the global mean being 330 +/- 8 nGy/h compared to a mean value of 92 nGy/h and 59 nGy/h for Malaysia and the world, respectively. The average annual dose from such terrestrial gamma radiation dose-rates to an individual residing in NS, assuming a tropical rural setting, is estimated to be 0.96 mSv per year.

Item Type:Article
Uncontrolled Keywords:environmental radioactivity, health physics
Subjects:Q Science
Divisions:Science
ID Code:62833
Deposited By: Fazli Masari
Deposited On:19 Jun 2017 08:26
Last Modified:19 Jun 2017 08:26

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