What is the primary material used to construct the output phosphor?

The primary material used to construct the output phosphor in fluoroscopic systems is Zinc Cadmium Sulfide (Zn CdS) doped with silver (Ag). This material is chosen for its high efficiency in converting X-ray photons into visible light, which is crucial for optimal image quality in fluoroscopy.

Zinc Cadmium Sulfide exhibits excellent luminescence properties, making it appropriate for applications where high sensitivity is required. The addition of silver enhances its light output by increasing the efficiency of the conversion process, allowing for clearer and brighter images on the monitor.

In contrast, while Gallium Arsenide is used in some photodetector applications, it is not the primary material for output phosphors. Silicon dioxide is typically used as an insulator or substrate material in various electronic components, and while Calcium Tungstate has historically been utilized as a phosphor, it is less efficient compared to Zinc Cadmium Sulfide in terms of light output for modern fluoroscopic applications.