Radiographic image intensifier

Details Radiographic image intensifier Radiographic image intensifier

1986-03-20

1988-02-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313542, H01J 3150

Patent

active

047257245

ABSTRACT:
An x-ray image intensifier including an input screen 3 having a radiation transparent support 7 on which is applied a fluorescence layer 8 of CsI, a translucent conductive barrier layer 9 which replenishes the photocathode 10 with electrons but tends to reflect incident light especially when made of metal, e.g. of aluminum 7 nm thick which reflects about 50% of the incident fluorescence. The improvement adds first and second intermediate layers 21, 22 of metal oxide e.g. respectively TiO.sub.2, MnO, which are semiconductive. The thickness of the first layer 21 adjusts the reflection amplitude to equal that at the photocathode-vacuum interface, and that of the second layer adjusts the relative phase so that the reflections cancel. The first and second layers can be non-conductors such as Al.sub.2 O.sub.3, however the second layer is then made thin enough, e.g. 25 nm or less, to allow electron conduction by tunnelling to occur.

REFERENCES:
patent: 3829728 (1974-08-01), Gudden et al.
patent: 4038576 (1977-07-01), Hallais et al.

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