The Photographic Action of Electrons in the Range Between 40 and 212 Kilovolts

The Hurter and Driffield curves and the absolute sensitivities of Eastman medium lantern slide plates are determined for electrons accelerated through differences of potential from 40 to 212 kilovolts. Within experimental error the H and D curves are identical in shape for the different voltages. The sensitivity reaches a peak near 100 kv and then drops off rapidly. This phenomenon may be utilized to increase the effective sensitivity of plates at high voltages by applying a thin, high density intensifying screen to the surface of the emulsion.