High resolution X-ray collimator/detector system having reduced sensitivity to leakage radiation
US4751391A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1986 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Dec 19, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J47/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ionization chamber X-ray detector which minimizes the effects of leakage X-rays in systems where a collimator is employed to define resolution. The active collection volume of each detector element is reduced to the actual volume occupied by the negative ion cloud resulting from an incident X-ray beam for optimum response to desired radiation while minimizing response to leakage radiation by a combination of reducing the width of the collector electrodes with wider spaces in between the collector electrodes, and providing metallized guard electrodes between the collector electrodes. The guard electrodes serve to collect electrons freed by ionization between the collector electrodes resulting from "noise" X-rays, preventing these particular electrons from building up a space charge, or from reaching the actual collector electrodes. In addition, electric field distortions are minimized, with a consequent avoidance of adverse effects on detector response characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.