Abstract
For gas Cherenkov counters employing wavelength shifters coupled to normal-glass phototubes, the vacuum ultraviolet transmission of the filler gas is of great interest. We have measured transmission to 1100 Å for an optical path of one atmosphere-meter of methane, ethane, Freon 14, propane, butane, isobutane, nitrogen, sulfur hexafluoride, Freon 22, and methyl chloride. Aging results on wavelength shifters are reported.
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