  An improved method of energy calibration of position-sensitive silicon
detector is presented. Instead of the parabolic function used in traditional
method, a new function describing the relation of position and energy is
introduced and achieves better energy resolution. For the 8.088 MeV alpha decay
of 213Rn calibrated by this new method, the energy resolution is determined to
be about 87 keV (FWHM), which is better than the result of the traditional
method, 104 keV (FWHM). In addition, different functions can be tried in the
new method, which makes the calibration of various detectors with different
performances possible.
