Direct radiographic imaging panel having a dielectric layer with an adjusted time constant

US6194727A · kind A · utility

Assignee

• Direct Radiography Corp. · US

Inventors

• Denny L. Y. Lee · West Chester, US
• James E. Davis · Wilmington, US

Key dates

• Filing date: Jul 6, 1998
• Grant date: Feb 27, 2001
• Expiry date: Jul 6, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10F39/195

Abstract

A panel for radiation detection having a plurality of sensors arrayed thereon. Each sensor includes a charge storage capacitor, a radiation sensitive layer over the charge storage capacitor and a dielectric layer over the radiation sensitive layer. The dielectric layer has an adjusted resistivity resulting in a time constant .tau.=.rho..kappa..epsilon..sub.0 between 0.050 and 20 seconds, wherein .kappa. is the dielectric constant of the dielectric layer, and .epsilon..sub.0 is the permitivity of free space. The radiation detection layer is a photoconductor, and the dielectric layer is, preferably, a linear segmented polyurethane.