Abstract
The quantum detection efficiency (QDE) of a three stage microchannel plate (MCP) image intensifier was calculated for X-ray photons in the energy range used in diagnostic radiology, i.e. 10–150 keV. The device studied used an MCP, made from glass with high atomic number constituents, as the primary X-ray absorber and photon-to-electron converter. The calculation of the QDE was based on a dosimetric approach, utilizing Fano's theorem. The QDE is defined as the probability of detecting an incident photon, and although the probabilities of absorbing the X-ray photon and of detecting the secondary electron each were strongly energy dependent, the product, i.e. the QDE, was found to be quite independent of energy in the range 30–150 keV. This was confirmed by experimental measurements with monoenergetic photons, which failed, due to the nature of the light pulse amplitude spectrum, to yield information on the absolute value of the QDE. The calculations indicated a QDE of about 8% for the device studied. The theoretical model was used to estimate potential improvements of the QDE by changes in the geometry and glass composition of the MCP.
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