Television X-ray-intensifier sensitivity

Papers have been published recently giving measurements of the minimum perceptible diameter of test objects as a function of contrast at various specified X-ray doses. Some data are available for single-stage X-ray intensifiers observed visually and for intensifying systems in which a camera tube is used indirectly to view the output of an intensifier. The present paper reports comparative data for a television system in which a special camera tube is used to view the X-ray screen directly.