Abstract
Measurements of the spectral efficiency of an x-ray camera in the 5–25 keV range are presented. The camera consists of a slow scan transfer device (a charge coupled device) optically coupled to a scintillator screen (Y2O2S:Eu). A straightforward method, using laboratory x-ray sources, allows one to carry out measurements in a larger energy range, typically from a few keV to tens of keV by means of a fluorescence wavelength dispersive spectrometer. The spectral responsivity of the x-ray imaging detector, in units of analog-to-digital converter in keV, is discussed. In particular, the assumption of a linear conversion from incident x-ray energy to visible photon energy is confirmed by the experiment.
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