Abstract
A series of nondestructive, low energy gamma-ray spectrometric measurements by means of intrinsic Ge detectors was carried out for the activity determinations of several naturally occurring radionuclides in marine sediments. The system was calibrated for efficiency using a radioactive sample obtained by combining standard radioactive solutions with a suitable matrix. This procedure is strictly only correct for the analysis of samples of similar composition with the same mass absorption coefficients at the investigated energies. Nevertheless, the efficiency calibration can be extended to different matrix samples if the variation in self-absorption is accurately taken into account. A method for calculating the self-absorption correction at any energy of interest is proposed and verified for the determination of 210Pb activity at an energy of 46.5 keV. The direct gamma method and the conventional, accurate, but tedious, alpha technique via 210Po, which can be alternatively applied to the determination of 210Pb, agreed mostly within 8%.
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