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Accurate efficiency calibration of a low‐energy HPGe detector using a monochromatic x‐ray source
Author(s) -
Plagnard Johann,
Bobin Christophe,
Lépy MarieChristine
Publication year - 2007
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.961
Subject(s) - detector , monte carlo method , monochromatic color , calibration , semiconductor detector , optics , synchrotron , physics , electromagnetic shielding , germanium , materials science , optoelectronics , silicon , statistics , mathematics , quantum mechanics
HPGe detector efficiency has been calibrated using complementary methods involving radioactive x‐ray standards, reference synchrotron flux (Super ACO, LURE, France) and a monochromatic x‐ray source (SOLEX), combined with Monte Carlo simulation. In the study described here, SOLEX was used to determine the thickness of detector components that create absorption sites in front of the active zone of the detector, by energy scanning in the vicinity of their K and L binding energies. The layers of aluminium (infrared shielding), nickel (electrical contact) and germanium (dead layer) have been measured. This approach ensures accurate determination of the thickness of each component and enables the detector efficiency calculation by Monte Carlo simulation. Differences between simulated data and experimental efficiency values are about 1–5% at energies above 1400 eV and reach 20% at lower energies. Copyright © 2007 John Wiley & Sons, Ltd.