Abstract
ABSTRACT Groundwaters were sampled from 730 wells being used for drinking purposes during 2007-2009. These samples wereanalysed using a gas-flow type GPC (Gas Proportional Counter) according to the USEPA method (900.0). We obtained agross-alpha counting TDS (total dissolved solid) efficiency curve (Y = 0.0017X2−0.3122X + 19.165, X = TDS, Y =efficiency, R 2 = 0.9734) using natural uranium standard to get gross α value of the samples. The gross alpha values rangedfrom MDA (minimum detectable activity) to 14.88 pCi/L and 429 samples showed values higher than MDA (< 0.9 pCi/L). Correlations of the uranium values with the total alpha values and the gross-alpha values indicate that uranium valueshave high impacts on gross-alpha values. Groundwater samples of study areas were classified into four regions accordingto the rock types; plutonic (granite) rock region (427 areas), metamorphic rock region (181 aeras), sedimentary rock region(70 areas), volcanic rock region (52 areas). Groundwater of Cretaceous granite presented the highest gross-alpha value.Gross alpha in groundwaters showed no relationship with uranium in terms of the geological ages, rocks and minerals. Keywords : Gross alpha, GPC, TDS efficiency curve, Groundwater, Geological age
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