Abstract
An X-ray imaging detector with good energy resolution, good spatial accuracy and high counting rate has been built for medical application. Based upon luminescence mechanism in noble gas, it requires, on the contrary to proportional counters, a high degree of gas purity but produces a significant improvement in energy resolution, due to the absence of the multiplication process. The energy resolution fwhm is typically 5.4% at 30 keV and the spatial resolution fwhm is 2.7 mm. Flourescence measurements on different elements, as well as on mixtures, and radioactive phantom imaging have been done, showing potential possibilities of this detector.
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