Precision efficiency calibration of a high-purity co-axial germanium detector at low energies
Language
en
Article de revue
This item was published in
Nucl.Instrum.Meth.A. 2020, vol. 984, p. 164631
English Abstract
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. Some of the previous measurements ...Read more >
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. Some of the previous measurements and Monte-Carlo simulations have been repeated with higher statistics and a new source measurement with 169 Yb has been added. For the energy range from 40 keV to 100 keV, an absolute precision for the detection efficiency of ± 0.2% has been reached, as previously obtained for energies above 100 keV. The low-energy behaviour of the germanium detector was further scrutinised by studying the germanium X-ray escape probability for the detection of low-energy photons. In addition, one experimental point, a γ ray at 2168 keV from the decay of 38 K, has been included for the total-to-peak ratios agreeing well with simulations. The same γ 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 60 Co source and found to be perfectly stable over a period of 10 years.Read less <
English Keywords
Gamma-ray spectroscopy
Germanium detector
Monte-Carlo simulations
semiconductor detector: germanium
numerical calculations: Monte Carlo
efficiency
calibration
gamma ray: irradiation
stability
Origin
Hal imported