Abstract

During evacuation of the X-ray tube there are conditions when vacuum gauges cannot be connected directly but only to an auxiliary volume connected to the X-ray tube through a tube of a relatively small conductance. Then the measured pressure is different from that in the X-ray tube. To determine the pressure and the flow of the released gas in the X-ray tube, it is necessary to calculate these from the measured pressure. Under certain assumptions, which, are usually fulfilled on evacuation of sealed-off vacuum systems, formulae enabling this calculation were derived. Experimental data, which was obtained during extensive study of X-ray tube evacuation, was used to put the formulae to the test.

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