Analytical calculation has been done to obtain energy resolution and pulse distribution of compressed gaseous xenon detector. Cylindrical chamber was considered. Calculation takes into consideration energy of primary gamma-ray, fluctuation of number of electron-ions pairs, space distribution of electrons to be produced into chamber, walls of chamber, recombination, H excess, parameters of electronic. Calculation was performed for xenon density less than 0.6 g/cm and H excess less than 2%.
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