الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
East Gebel Hamid area is located at the northern part of the Western Desert between latitudes 29° 40¢ & 29° 52¢ north and longitudes 30° 34¢ & 30° 58¢ east covering an area of about 590 Km2. The study area has been covered recently by systematic aerial magnetic and multi-channel gamma-ray survey. This survey was flown by the Airborne Geophysics Department, Exploration Division, Nuclear Materials Authority (NMA) of Egypt in November 2005, as a part of its comprehensive uranium exploration program.
Application of composite image technique has been developed to interpret qualitatively airborne gamma- ray spectrometric survey data. The integrated results gained from these methods were illustrated “interpreted radio-spectrometric zonation” map (IRS). The IRS map shows thirteen zones. The uranium composite image map has been examined and produces an identical seven uranium leads. The spectral radiometric data within the interpreted seven uranium leads have been evaluated and analyzed statistically. All the results showed that lead No. 3, associated with Late Oligocene of Gebel Qatrani formation, is the highest one of all leads in uranium potentiality with average 10.24 ppm equivalent uranium.
Heat production is calculated using Rybach’s formula depending on the density and the concentration of radio-elements U, Th and K in the rock. The radioactive heat production distribution for the sedimentary rocks value is higher than those of basaltic sheet which has range between 0.54 µWm-3 and 4.76 µWm-3.
The natural radiation (exposure rate) of the study area is frequently referred as a standard for comparing additional sources of man-made radiation. Furthermore, the dose rates from the terrestrial gamma-radiation range from 0.0 to1.54 mSv/y. The values between (0, 1) remain in the safe side and the values between (1, 1.54) should be subjected for further follow up investigation.
The airborne magnetic data obtained from the survey over East Gebel Hamid area has been analyzed by various techniques. The integration of these techniques has been resulted in the construction of the interpreted magnetic basement tectonic map. The interpreted basement tectonic map has been quantified through the application of 2D-magnetic modeling technique. The structural lineaments map shows three important systems of faults (NNE-SSW, E-W & NW-SE). To confirm the interpreted basement structural relief of the study area, 2D magnetic modeling was carried out along two profiles AA′ and BB′ oriented in NW-E trend and NE-S trend respectively. An important notice of the modelled profile AA′ and BB′ is the presence of basaltic layer which trends in the same direction of the model with magnetic susceptibility 0.004 c.g.s. unit. This basaltic layer reaches the surface and this is in agreement with the surface geologic map.
Key Words (not more than 10): Airborne Magnetic Survey- Gamma-Ray Spectrometric Survey- East Gebel Hamid Area- Northern Western Desert- Magnetic Data Analysis- Gamma-ray Spectrometric Data Interpretation- Structural and Tectonic Setting of Northern Western Desert- Uranium Anomalies of Qatrani Area.