Radiation detector for an automatic X-ray exposure timer

Details Radiation detector for an automatic X-ray exposure timer Radiation detector for an automatic X-ray exposure timer

1977-03-02

1978-06-13

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250322, 250355, H05G 144, H01J 3928

Patent

active

040951090

ABSTRACT:
In an illustrated embodiment a radiation detector is to be arranged in front of a xeroradiographic cassette and yet to avoid adverse effects on the xerographic image. To achieve this the shielding layer for the cassette is a graphite layer and the electrode layer consists of a vacuum-deposited electrically conductive material having a low atomic number. Desirably the electrode layer has marginal zones which continuously decrease in thickness so that no sharp absorption contours are present which would be over-accentuated in xerographic image production. Because of the utilization of a graphite layer as a protective shield, the absorption of the radiation detector can be kept very small. Electrical contact with the vacuum deposited electrode layer may be by means of a graphite layer which is in electrical contact with the electrode layer.

REFERENCES:
patent: 2825816 (1958-03-01), Rogers
patent: 3679902 (1972-07-01), Hurst et al.
patent: 3988584 (1976-10-01), Lange et al.

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