The output phosphor of most modern intensifiers is made of:

The output phosphor of most modern image intensifiers is typically made of zinc cadmium sulfide. This material is favored because it has excellent luminescent properties, which enhance the conversion of x-rays into visible light. When x-rays strike the output phosphor, they stimulate the phosphor to emit more light than the original x-ray signal, thereby increasing image brightness and contrast.

Zinc cadmium sulfide is particularly effective because it can produce a significant amount of light in the visible spectrum, making it ideal for imaging applications. This quality contributes to improved image quality and sensitivity in fluoroscopic procedures.

Other options, while used in various applications, do not match the specific properties that zinc cadmium sulfide provides in the context of image intensifiers. Calcium tungstate, for instance, was used in older systems but has been largely replaced due to advancements in technology that favor materials offering better efficiency and brightness.