%0 Journal Article
%T Radioactive and Geochemistry Characteristics of the Garnetiferous Granite of Um Sleimat Area, Egypt.
%A A.M.El-Arabi
%A Adel G.E. Abbady
%A I. H. Khalifa
%J Online Journal of Earth Sciences
%D 2012
%I 
%X This work presents a study of radioactive, geochemical features and radiation dose of garnetiferous granite of Um Sleimat area, which located 80 km south of Marsa Alam on the Red Sea coast. The gamma radiation in samples was measured, employing high-resolution ¦Ã-ray spectroscopy. The rock samples were measured in the laboratory with an accumulating time between 10 and 14 h each. From the measured ¦Ã-ray spectra, activity concentrations were determined for 226Ra (from 45.5 7 to 130 11 with average 77.9   8.7 Bq.kg-1), 232Th (range from 36.7 6 to 77.5  9 with average 52.8   7.2 Bq.kg-1) and 40K (from 1299.7  36 to 1521.6   39 with average 1424.9   38 Bq.kg-1). To assess the radiological hazard of the natural radioactivity in the samples, the radium equivalent activity, the absorbed dose rate and the external hazard index were calculated. radium-equivalent activities (Raeq) for all granite samples were less than the maximum limit 370 Bq.kg-1. The total absorbed dose rates in air calculated from the concentrations of the three radionuclides ranged from 98.6 to 158.4 nGy.h-1. The external annual effective dose rate of the region was determined to be between 0.56 and 1.42 mSv.y-1, with an average value 0.90 mSv.y-1. This study provides a baseline map of radioactivity background levels in the Egyptian environment and will be used as reference information to assess any changes in the radioactive background level due to geological processes. The Um Sleimat granite, from uranium mineralization, has normal economic potential.
%U http://www.medwellonline.net/abstract/?doi=ojesci.2007.9.20