Performance of a Flight Model Gas Scintillaticn Counter Spectrometer for X-Ray Astronomy

Results are presented on the performance of a large area gas scintillation proportional counter (GSPC) experiment for application as a spectrometer in X-ray astronomy. Two such counters will be launched on an Aries sounding rocket in 1979. This experiment has a total collecting area of 630 cm2, and an energy resolution of 11% for 6 keV X-rays. The intrinsic background rejection capability with the aid of burst length discrimination was ~ 80% for an X-ray acceptance of 80% at 6 keV.