BLANK, B.; ASCHER, P.; GERBAUX, M.; GIOVINAZZO, J.; GREVY, S.; KURTUKIAN NIETO, T.; VERSTEEGEN, M.; THOMAS, J.C.

doi:10.1016/j.nima.2020.164631

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BLANK, B.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

ASCHER, P.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

GERBAUX, M.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

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Nucl.Instrum.Meth.A. 2020, vol. 984, p. 164631

Résumé en anglais

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.< Réduire

Mots clés en anglais

Gamma-ray spectroscopy

Germanium detector

Monte-Carlo simulations

semiconductor detector: germanium

numerical calculations: Monte Carlo

efficiency

calibration

gamma ray: irradiation

stability

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Precision efficiency calibration of a high-purity co-axial germanium detector at low energies

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