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We measured the conversion efficiency of laser pulse energy into xrays from a variety of solid planar targets and a Xe gas puff target irradiated using a high average power Nd:glass slab laser capable of delivering 13 IIS FWHM pulses at up to 20 J at 1.053 pm and 12 J at 0.53 pm. wavelength band, including L-shell emission from materials with With 1.053 pm a maximum conversion of 10% into 2n; sr was measured from solid Xe and type 302 stainless steel targets. At 0.527 pm efficiencies of 12-18%/(2~ sr) were measured for all of the solid targets in the same wavelength band. The x-ray conversion efficiency from the Xe gas puff target was considerably lower, at about 3%/(27c sr) when irradiated with 1.053 pm. . .Targets where chosen to optimize emission in the 9-19 A yr . atomic numbers in the Z=2430 and M-shell emission from Xe (Z=54).