A preliminary calibration of the new airborne gamma-ray spectrometer survey system of Egypt

The calibration of any spectrometer could be considered as the principal co ntrolling factor and the most important step in carrying out a high-quality radiospectrometric survey, Four Canadian standard concrete calibration pad s 1.0 m x 1.0 m x 0.3 m, weighing approximately 675 kg each, manufactured b y Grasty and supplied from the IAEA were used for the preliminary calibrati on of the new airborne gamma-ray spectrometer survey system of Egypt. They comprised a low radioactivity background, a potassium, a uranium, and a tho rium pad. In this work, most of the gamma radiation impacting the sensors i s recorded. A computer program for finding the system stripping ratios and sensitivities was designed. The computed values were found to be in good ag reement with the international ones.