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A Fluorescent Gated Proportional Counter For X-Ray Astronomy

The development of a position sensitive proportional counter having a large drift volume is reported here. It incorporates a fluorescent gating technique which results in a large improvement in background rejection, over conventional proportional counters, and in addition offers the benefit of enhanced energy resolution (predicted to be ≈ 3% at 40 keV) above the K-shell of xenon.