Abstract
Based on the coincidence behaviour of a 5′'×5′' NaI(Tl) well-type detector in measuring radionuclides with coincident gamma transitions, a procedure is described which allows to determine the energy-dependent detector efficiency to a high degree of accuracy. The method only requires the determination of the counting rates of uncalibrated gamma sources placed inside as well as outside the detector hole. Apart from coincident gamma sources a few monoenergetic gamma sources are needed to allow some interpolation in gamma energy. The accuracy obtained for the energy-dependent efficiency is of the order of 0.3%.
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