a. The final data are presented in four different forms: on magnetic tape; on microfiche; in graphic form as profiles and histograms; and in map form as anomaly maps, flight path maps, and computer printer maps  A comprehensive study of the efficiency calibration and calibration verification of Ge gamma-rayspectrometers was performed using semi-empirical, computational Monte-Carlo (MC), and transfer methods. The aim of this study was to evaluate the accuracy of the quantification of gamma-emitting radionuclides in complex matrices normally encountered in environmental and food samples. A wide range of gamma energies from 00.0 to 0000.0 keV and geometries from a 00-mL jar to 0.0-L Marinelli beaker were studied on four Ge spectrometers with the relative efficiencies between 000% and 000%. Density and coincidence summing corrections were applied. Innovative techniques were developed for the preparation of artificial complex matrices from materials such as acidified water, polystyrene, ethanol, sugar, and sand, resulting in the densities ranging from 0.0000 to 0.000 g cm