  The MAJORANA DEMONSTRATOR was a search for neutrinoless double-beta decay
($0\nu\beta\beta$) in the $^{76}$Ge isotope. It was staged at the 4850-foot
level of the Sanford Underground Research Facility (SURF) in Lead, SD. The
experiment consisted of 58 germanium detectors housed in a low background
shield and was calibrated once per week by deploying a $^{228}$Th line source
for 1 to 2 hours. The energy scale calibration determination for the detector
array was automated using custom analysis tools. We describe the offline
procedure for calibration of the Demonstrator germanium detectors, including
the simultaneous fitting of multiple spectral peaks, estimation of energy scale
uncertainties, and the automation of the calibration procedure.
