X-ray image intensifier tube with improved entrance section

Details X-ray image intensifier tube with improved entrance section X-ray image intensifier tube with improved entrance section

1992-10-13

1994-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313542, H01J 3150

Patent

active

053671554

ABSTRACT:
In an X-ray image intensifier tube an entrance section is optimized in respect of image quality, optical aberrations and efficiency. To achieve this, notably in order to avoid photocathode charging phenomena, a separating layer having an adapted electrical transverse conduction is provided. In order to reduce scattered radiation, an edge portion of the entrance screen is deactivated for relevant examinations. In order to increase efficiency, use is made of a double phosphor layer having different X-ray absorption properties. In order to compensate for vignetting a radial variation of the thickness or of the radiation properties of a separating layer or of the luminescent layer itself is used.

REFERENCES:
patent: 3716713 (1973-02-01), Levin
patent: 3825763 (1974-07-01), Ligtenberg et al.
patent: 4712011 (1987-12-01), Van Leunen
patent: 4725724 (1988-02-01), Van Der Velden
patent: 4820926 (1989-04-01), Popma et al.
patent: 4831249 (1989-05-01), Van Der Vekden et al.
patent: 4967080 (1990-10-01), Urakami et al.

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