Abstract

The impulse breakdown of several gases at pressures of a few microns of mercury has been investigated. During the first stage of the discharge, a microsecond burst of X-rays is emitted from a spot of about 8 mm diameter on the anode electrode. If the initial voltage applied to the tube is 600 kV, a single X-ray pulse will produce a legible radiograph through about 5 cm of steel. The mechanism of the discharge has been studied and high-speed photographs of the visible discharge show a luminous column moving from cathode to anode. Steenbeck's theory(3) has been extended to show qualitatively the probable sequence of events during the discharge.

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