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Updated: Dec 26, 2025

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Published on: January 30, 2020
Absolute determination of low-energy X-ray emission rates with a proportional counter
V H Elvira1, V Peyrés1, M Roteta1
1CIEMAT, Laboratorio de Metrología de Radiaciones Ionizantes (LMRI), Avenida Complutense 40, 28040, Madrid, Spain.
Abstract:
A defined-solid-angle proportional counter has been designed for the absolute determination of X-ray emission rates between 2 keV and 10 keV. The main features of the counter are described in this work, and spectra of two radionuclides with low-energy X-ray emissions are presented. The activity concentration of an 55Fe solution was determined by measuring the emission rate of three samples and using tabulated emission probabilities. This activity concentration is compared with the value obtained by liquid scintillation counting, and an excellent agreement has been found.
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