Entrance window design parameters for high-pressure gas x-ray imaging detectors
| Autor: | Lawrence M. Jordan, Frank A. DiBianca |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Radiation
Materials science business.industry Contrast resolution Detector Window (computing) Condensed Matter Physics Pressure vessel Anode Detective quantum efficiency Optics Ionization Radiology Nuclear Medicine and imaging Electrical and Electronic Engineering business Instrumentation Beam (structure) |
| Zdroj: | Journal of X-ray science and technology. 5(2) |
| ISSN: | 0895-3996 |
| Popis: | Gas ionization x-ray detectors operating at pressures up to 100 atm offer inherently high spatial and contrast resolution. However, incorporating the detector x-ray entrance window in a conventional pressure vessel designed for such pressures can result in high primary beam loss in the window and a much reduced overall detective quantum efficiency. The design of a gas chamber cover plate for a strip beam detector which mechanically isolates the x-ray entrance window from the lateral tensile stresses in the chamber body is described. A number of test windows of this design, varying in three geometric parameters-thickness, window curvature, and fillet radius-were fabricated from wrought aluminum [6061-T651 ] and subjected to pressures of up to 400 atm for the purpose of selecting an optimum window for a prototype digital x-ray imaging detector. The experimental data indicate that windows can be designed for a detector admitting a 1.0 cm wide x-ray beam that have rupture pressures exceeding 500 atm while maintaining x-ray transmittances of as much as 93.4% for a 120 kVp tungsten anode spectrum. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|