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TERRESTRIAL GAMMA RADIATION DOSE AND ITS RELATIONSHIP WITH SOIL pH LEVEL IN SERI GADING INDUSTRIAL AREA, BATU PAHAT DISTRICT, MALAYSIA. Saffuwan Mohamed Johar1* and Zaidi Embong2 1
Department of Science, Faculty of Science, Technology and Human Development, Universiti Tun Hussein Onn Malaysia, Malaysia 2 Research Center for Soft Soil (RECESS), Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia
[email protected] An extensive survey was carried out for gamma dose rates in the Sri Gading Industrial Area, Batu Pahat District, Johor, Malaysia. The study area was chosen due to its highest terrestrial gamma radiation in Batu Pahat District. The measurements of absorbed dose in air were conducted above the soil surface at height of 0 meter using Ludlum Model 19 survey meter at 100 random points within the area. Gamma absorbed dose rates in air outdoors (GDR) were calculated to be in the range between 139.2 nGy/h and 539.4 nGy/h with an arithmetic mean of (337.7±67.4) nGy/h. Workers of Sri Gading Industrial Area are subjected to external gamma radiation exposure (effective dose) ranging between 0.171 and 0.662 mSv/y with an arithmetic mean of (0.414±0.083) mSv/y. The soil pH level was measured at the point where absorbed dose in air was taken to determine the possible association between the GDR and pH soil level using the Pearson r correlation. It is found that the simple linear correlation between the two quantities is inversely proportional with the Pearson r value = -0.12. Keywords : terrestrial gamma radiation dose, gamma absorbed dose rates, external gamma radiation exposure (effective dose), soil pH level
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30/11/2013
