Radiation detector for an automatic X-ray exposure timer
US4095109A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1977 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Mar 2, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J47/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.