X-ray production in wide-gap helium and air discharges was investigated using calibrated film-badge detectors. Helium discharges were found to produce x rays with average energies in the range <11 to 13 keV. The energies were independent of applied electric field for average E/p ratios between 35 and 140 V/cm·Torr. X-ray intensities were proportional to the atomic number of the electrode material. No evidence for similar x-ray production was found in air discharges.
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Noggle et al. (1968) studied this question.
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