Abstract: A semiconductor for the measurement of optical radiation dosage comprising a semiconductor body having a doped surface layer on a doped substrate, the surface layer having a conductivity appreciably higher than the substrate thereby to form at the transition a potential barrier with a space charge region whereat carrier pairs are produced with the incidence of optical radiation, where various parameters of the surface layer and the substrate are so selected that the conductivity due to stored photoconductivity varies according to a chosen characteristic law with change in optical radiation dosage, and electrodes applied to the surface layer are connected in a measuring circuit to measure the stored photoconductivity.

Abstract: The pattern of X-rays produced by interaction of a beam of X-rays and a ted object is converted to an optical signal by a fine-grained zinc silicate screen which is viewed by a television camera through a magnifying optical system. The combination of a fine-grained luminescent screen of high resolving power with a camera having a photosensitive surface of much lower resolving power and high sensitivity provides real-time images of structural details not heretofore visualized except by photographic processes.