Ion Chambers for Fluorescence and Laboratory EXAFS Detection

摘要

It is possible to design gas ionization chambers with a noise equivalence of 10 exp 3 photons per second for 10 keV x-radiation. With such a low noise level, ion detectors can be used for laboratory EXAFS facilities and fluorescence detectors at national synchrotron facilities where the detected signal is above 10 exp 3 photons/s. In such use the ion chambers are limited by statistical noise and produce as good a signal to noise as counting detectors. The advantages of ion chambers are simplicity, high linearity at high counting rates, and large detecting area. (ERA citation 07:015483)