X-ray pulses from glow discharges

Alexander Karabut has reported pulses of 1.5 keV X-rays from glow discharges operated at <=0.5 Amps, <=10 Torr, and 500-2500 Volts. (Condensed Matter Nuclear Science, Jean-Paul Biberian, ed., World Scientific, 2006, pg 253). This should not be a surprise.  One can expect dust particles impacted by a 500-2500 Volt electron beam to produce such X-ray pulses.