Radionuclide-free efficiency calibration of an HPGe detector using monochromatic photon beams calibrated with a cryogenic radiometer

Víctor H Elvira; Marie-Christine Lépy; Yves Ménesguen; Stéphanie Melhem

doi:10.1016/j.apradiso.2023.111087

Radionuclide-free efficiency calibration of an HPGe detector using monochromatic photon beams calibrated with a cryogenic radiometer

Appl Radiat Isot. 2024 Jan:203:111087. doi: 10.1016/j.apradiso.2023.111087. Epub 2023 Oct 27.

Authors

Víctor H Elvira¹, Marie-Christine Lépy², Yves Ménesguen², Stéphanie Melhem²

Affiliations

¹ Université Paris-Saclay, CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France. Electronic address: victor.hernandez-elvira@cea.fr.
² Université Paris-Saclay, CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.

PMID: 37951034
DOI: 10.1016/j.apradiso.2023.111087

Abstract

A cryogenic electrical-substitution radiometer was used for the primary calibration of monochromatic photon beams at synchrotron, which are in turn employed to determine the intrinsic efficiency of an HPGe detector between 3.5 keV and 8 keV. This allowed the determination of the thickness of the dead layer, which enabled the calculation of the efficiency up to 55 keV, where the active thickness is not determinant. The geometrical efficiency was determined through the measurement of a radioactive source at variable distances.

Keywords: Cryogenic detector; Efficiency calibration; Photon emission intensities; Semiconductor detector; Synchrotron radiation.