The detection efficiency of the Si(Li) electron spectrometer as a function of electron energy was measured using

131

I and

207

Bi calibration sources having seven different energies from 45keV to 1000keV. The curve fit and interpolation of the efficiency curve were also made. The interpolation error of the curve was about 8.7%. By measuring internal conversion coefficiency of

67

Zn reliability of efficiency curve was checked experimentally.