Abstract
We have developed a MWPC system for X-ray detection with a position resolution in the region of 6 μm rms (14 μm fwhm). The performance with argon, krypton or xenon at pressures from 1 to 10 atm is explored for the X-ray energy range 5–25 keV. At a resolution of 6 μm rms the effects of photoelectron and Auger electron range, electronic noise, avalanche spread, lateral electron diffusion, as well as X-ray beam collimation, become of comparable magnitude. Their limiting effects on avalanche centroid fluctuation, and hence on position resolution, are investigated. The position resolution achieved in this work compares favorably with that of solid state devices.
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