Entrance phosphor

Last revised by Peerzada Mohammad Iflaq on 10 Mar 2022

The entrance phosphor (or input phosphor) is a component of the image intensifier in fluoroscopic systems that converts the energy from x-rays into light photons. It is composed of a fluorescent material such as cesium iodide activated with sodium (CsI:Na) and coats the entrance surface of the image intensifier. The light produced by the entrance phosphor subsequently travels to a photocathode layer.

In earlier days Zinc-cadmium sulfide activated with Silver was used as the material for input phosphor, but CsI:Na was subsequently used as it provides better image quality owing to its high packing density, favorable atomic number and vertical orientation of crystals.

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.