DIRECT RADIOGRAPHIC IMAGING PANEL HAVING A DIELECTRIC LAYER WITH AN ADJUSTED TIME CONSTANT

摘要

A radiation detection sensor (10) includes a charge storage capacitor (14), a radiation sensitive layer (50) over the charge storage capacitor, and a dielectric layer (52) over the radiation sensitive layer. The dielectric layer has an adjusted resistivity rho resulting in a time constant tau = rho kappa epsilon 0 between 0.050 and 20 second, wherein kappa is the dielectric constant of the dielectric layer, and epsilon 0 is the permittivity of free space. The radiation sensitive layer is a photoconductor, and the dielectric layer is, preferably, a linear segmented polyurethane.