X=ray image intensifier tube - has accelerating and braking voltages supplied to anode and phosphor-coated output screen respectively with lower voltage on output screen

摘要

A high voltage generator supplies the photocathode, the electrodes of the electron beam deflection system, the anode (10), and the output screen (11) which has a phosphor coating on the inside of a transparent plate under an Al film. The anode is maintained at an accelerating voltage of e.g. 30 kV. The long life output screen acts as a brake on the electron beam, reducing the energy of impact by virtue of its lower voltage, adjusted within the range of 5 to 25 kV. ADVANTAGE -High accelerating voltage is possible with thin phosphor coating for high optical gain.