Full-energy peak efficiencies of Ge (Li) detectors in the gamma-ray energy range of 120 to 2800 keV were experimentally measured by using calibrated standard sources. Five kinds of analytical function were fitted to the experimental points by leastsquares method. Fittabilities of these functions to the points in the different gamma-ray energy range were compared. As a result, the most successful of these functions was the polynomial, 1n ε (E) =NΣi=0 ai (1nE) i, where ε is the efficiency and E is the corresponding gamma-ray energy.
Antimony-121 Mössbauer spectra of antimony compounds, with large absorption intensity of ca. 30% were obtained by cooling both a Ca121mSnO3source and an absorber at 20 K using a cryostat incorporating a closed cycle refrigerator and counting the 7.4keV escape peak generated by the 37.1keV γ-rays in a Xe-CO2proportional counter. The121Sb Mössbauer spectroscopy was found to be very useful in characterizing various substances containing antimony atoms.