STANDARDIZATION OF AIRBORNE GAMMA-RAY SPECTROMETRIC SURVEY DATA CORPORATED WITH AIRBORNE MAGNETIC DATA OF GABAL GHARAMUL AND ITS SURROUNDING, NORTHERN EASTERN DESERT, EGYPT

Abstract

During May 2003, the Airborne Geophysics Department of the Nuclear Materials Authority (NMA) of Egypt conducted high resolution magnetic and multi-channel gamma-ray survey covering 1,900 km2 over the G. Gharamul and its surrounding. The gamma-ray spectrometric data was acquired along flight-lines directed at 51o or 231o azimuth degrees and spaced at 250 m. The tie lines spaced at 400 m, acquired along 141o or 321o, orthogonal to the flight lines.Themagnetic data was acquired along flight lines spaced at 1000 m and along control lines spaced at 4000 m. Nominal flying elevation was about 100 m (330 ft.) terrain clearance. This mission has been accomplished using the NMA geophysical survey twin-engine Beechcraft King-Air C90 (Turbine engines).This aircraft was equipped with a multi-sensor airborne geophysical survey system. This comprises a Picodas (PDAS-1000) high sensitivity 256-channel gamma-ray spectrometer system and a high resolution Scintrex airborne Cesium-vapour magnetometer. In this study a correlation between the ground and airborne gamma-ray data has been generated to standardize the airborne gamma ray spectrometric data in the surveyed area. These will provide a mathematical form that can be used to convert the airborne data to the ground data. Also,the evaluation and interpretation of the aerialradio spectrometric after standardization and magnetometric survey data acquired over G. Gharamul area and its surrounding is one of targets. Between 7th October 2012 to 11th October 2012 the field trip was conducted. The ground gamma ray spectrometric survey was carried out along three distributed profiles in thestudy area. Twoof them are traverse lines trending 51º and one tie line trending 141º. Using the global positioning system was necessary to determine the ground points accurately with the same aircraft coordinate. The time of the measurement at each point was 30 sec to get the reading of potassium, uranium, thorium and total count. GS-512 gamma-ray spectrometer is used during measurements.