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High Purity Germanium (HPGe) detector gamma-ray spectrometry with 500 cc Marinelli beaker geometry was used for radioactivity measurement in some specific areas of Kingdom of Saudi Arabia (KSA). The detection limits of  210 Pb,  238 U,  226 Ra,  232 Th and  40 K in soil, fertilizers, and vegetables lie mostly below 1 Bq/kg. The activity concentrations of  238 U and  226 Ra in local phosphate fertilizers were measured in the range of 236.8–879.0 Bq/kg and 101.5–297.0 Bq/kg, respectively. The respective activity concentrations of  238 U and  226 Ra measured in one charge of German phosphate fertilizer are in the range of 552.7–790.0 Bq/kg and 280.6–317.0 Bq/kg. The activity concentrations of  232 Th are assessed to have maximum values up to 2.24 Bq/kg in locally manufactured phosphate fertilizers. Local urea exhibited concentration level (Bq/kg) of  210 Pb,  238 U,  226 Ra,  232 Th and  40 K below the detection limit. Mean values of activity concentrations of  238 U in agricultural soil of Wadi Fatima, Taif, Hada Al-Sham, Madina City and Abyar Al-MashiMadina are 21.7 ± 3.24, 38.2 ± 4.1, 17.6 ± 2.1, 34.3 ± 3.5 and 32.7 ± 2.4 Bq/kg, respectively. The respective mean of  226 Ra activity concentrations in those areas are 12.16 ± 1.16, 20.2 ± 1.33, 11.21 ± 0.4, 21.4 ± 1.7 and 21.0 ± 1.22 Bq/kg. The specific activity of  232 Th in the respective areas has been measured as 12.6 ± 1.3, 25.3 ± 0.8, 11.5 ± 0.9, 20.4 ± 2.4 and 20.0 ± 1.2 Bq/kg. Activity concentrations of  210 Pb,  238 U,  226 Ra and  232 Th in the vegetable samples are mostly found in the range of 0.37 Bq/kg to 37.8 Bq/kg. The  40 K specific activity lies in the range of 44.4–196 Bq/kg. The calculated absorbed dose rates in the representative locations are 24.07–53.28 nGy/h.

radiochimica acta

Natural radioactivity measurements in agricultural             soil, fertilizer and crops in some specific areas of Kingdom of             Saudi Arabia