Abstract
We show that use of the radionuclide 56Co for calibration of the full energy peak efficiency, e, of a coaxial HPGe detector, in addition to the commonly employed set of activity standards (133Ba, 241Am, 152Eu, 57Co, 137Cs, 88Y, 65Zn), affects significantly the e values in the high energy region. This change resulted in substantial improvement of the accuracy of Ca determination by k 0-INAA via the 49Ca radionuclide, which emits predominantly the 3084 keV photons, as demonstrated by Ca results in NIST SRMs 1547 Peach Leaves, 1633b constituent elements in coal fly ash, and 2711 Montana II Soil.
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