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Low‐E extension of a hand‐held Compton spectrometer
Author(s) -
Derrien Jonathan,
Tondeur François,
Berrendorf Christopher,
Gerardy Isabelle
Publication year - 2019
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.3130
Subject(s) - deconvolution , spectrometer , detector , kerma , energy (signal processing) , physics , range (aeronautics) , source code , computational physics , optics , computer science , materials science , dosimetry , nuclear medicine , operating system , medicine , quantum mechanics , composite material
The MICOS Compton spectrometer is a tool for the routine spectrometric control of X‐ray generators, mainly in the medical field (<150 kV). The use of a pen‐type NaI (Tl) detector with thin Be window allows to extend its range down to 6 keV, for a better evaluation of the low‐E side of the spectrum, which is determined by filtration. A specific problem is encountered in the deconvolution of the spectrum at very low energies, dominated by the K escape of iodine. The proposed solution combines an approximate step‐by‐step application of the GRAVEL algorithm, whereas the MAXED unfolding software is used for reaching the final solution. A new computer code was developed that combines spectrum acquisition and deconvolution and calculates the main characteristics of the source spectrum: end point energy, mean energy, energy at 50% of the left slope, and air kerma at 1 m from the source.