An avalanche-mode amorphous Selenium photoconductive layer for use as a camera tube target

It was found for the first time that an evaporated amorphous photoconductive layer of selenium produced the phenomenon of avalanche multiplication, and an amorphous photoconductive layer was used as the target in an experimental camera tube. The camera tube shows high sensitivity, greatly in excess of a quantum efficiency of unity, the upper limit of the sensitivity of a conventional blocking target layer. Deterioration of lag and resolution characteristics were hot observed. The noise produced by the avalanche mode was negligible. This experimental target layer is expected to prove especially suitable for high-performance camera tubes.