Measurements of Radiation Doses of Natural Radioactive Material in Oil fields at West Kourdofan

Abstract

Scale, sludge and sand samples were collected and analysed using thallium activated sodium iodide NaI(Tl) spectrometer to determine type, activity concentration, absorbed dose rate and annual effective dose of naturally occurring radioactive material (NORM) of samples collected from oil fields at West Kourdofan state. Scale radionuclides was found to be, 238U, 232Th and 40K at concentrations ranged from (4106.9 - 358.05) Bq/Kg, (2736.7 - 375.88) Bq/Kg and (9294 - 16.07) Bq/Kg respectively. Concentrations in sludge was ranged from (655.36 - 23.3) Bq/Kg for 238U, (396.34 - 16.19) Bq/Kg for 232Th and (353.52 - 16.07) Bq/kg for 40K. Concentrations in sand for 238U was ranged from (2807.36 - 13.89) Bq/Kg, for 232Th was ranged from (3466.24 - 14.6) Bq/Kg and for 40K ranged from (614.89 - 16.06) Bq/kg. Absorbed dose rate of scale samples ranged from (3692.01 - 398.03) nGy/h, sludge samples ranged from (542.84 - 30.49) nGy/h, sand samples ranged from (3395.25 - 23.42) nGy/h. Annual effective dose of scale samples was ranged from (4.53 - 0.49) mSv/y, sludge samples was ranged from (0.7 - 0.08) mSv/y. sand samples was ranged from (4.16 - 0.02) mSv/y.