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  • 1 Karpov Institute of Physical Chemistry Section Obninsk USSR
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For simplicity and unification of the comparator methods it is proposed to obtain a calibrating function of changing relative efficiency of registrating -radiation for any geometry of measurement (for any detector) from -spectrum comparator isotopes directly. In determining elements by their short- and medium-lived radionuclides the comparators52V and24Na were used. Biisotope comparator (65Zn,122Eu or182Ta) was used for long-lived radionuclides. The developed universal comparator method significantly simplifies the procedures for determining relative registration efficiencies of analytical lines of interesting radionuclides, thus reducing the labor and time requirements of analysis; this is very important in the case of a large scale NAA.