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Entrance phosphor

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.

Imaging technology

Article information

rID: 31747
Synonyms or Alternate Spellings:
  • Input phosphor

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