A sealed Ti window proportional counter sensitive to x radiation in the energy range 0.35ndash;0.45 keV and 1.5 keV is described. Measurements of the Ti mass absorption coefficients and a graphical summary of the literature values are presented. For a proportional counter with a 930 mgr;gsol;cm2(2.1 mgr;) Ti window, the peak efficiency at 0.45 keV is found to lie between 4.6percnt; and 7.1percnt;. An application in xhyphen;ray astronomy involving a rocket observation of Sco Xhyphen;1 is discussed.
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