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An array of plastic scintillator photomultiplier detectors was used to determine the high‐energy (hν≫35 keV) photon spectra of a 130‐kJ, 60‐kV gas‐injected coaxial gun experiment. The detector array used six different filter material/thickness combinations. High‐energy photon signals were readily observed. The spectra were determined by deconvolution. The spectra have three characteristic components—radiative emission from high Z impurities in the plasma, beam‐target excited line emission, and thick‐target bremsstrahlung from an electron beam generated in the plasma column. The electron beam consistent with the thick‐target bremsstrahlung assumption was of the order of 100 A above 10 keV.