Following work done in the energy region above 100 keV, the high-precision calibration of a co-axial high-purity germanium detector has been continued in the energy region below 100 keV. Previous measurements or Monte-Carlo simulations have been repeated with higher statistics and new source measurements have been added. A precision as in the high-energy part, i.e. an absolute precision for the detection efficiency of 0.2%, has been reached. The low-energy behaviour of the germanium detector was further scrutinized by studying the germanium X-ray escape probability for the detection of low-energy photons. In addition, one experimental point, a gamma ray at 2168 keV from the decay of 38K, has been included for the total-to-peak ratios agreeing well with simulations. The same gamma ray was also added for the single- and double-escape probabilities. Finally, the long term stability of the efficiency of the germanium detector was investigated by regularly measuring the full-energy peak efficiency with a precisely calibrated 60Co source and found to be perfectly stable over a period of 10 years.
@article{arxiv.2004.03464,
title = {Precision efficiency calibration of a high-purity co-axial germanium detector at low energies},
author = {B. Blank and P. Ascher and M. Gerbaux and J. Giovinazzo and S. Grevy and T. Kurtukian Nieto and M. Versteegen and J. C. Thomas},
journal= {arXiv preprint arXiv:2004.03464},
year = {2020}
}