Entrance phosphor
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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 caesium 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, favourable atomic number and vertical orientation of crystals.
-<p>The <strong>entrance phosphor</strong> (or <strong>input phosphor</strong>) is a component of the <a href="/articles/image-intensifier">image intensifier</a> in <a href="/articles/fluoroscopy">fluoroscopic systems</a> that converts the energy from x-rays into light photons. It is composed of a fluorescent material such as caesium 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 <a href="/articles/photocathode">photocathode</a> layer.</p>- +<p>The <strong>entrance phosphor</strong> (or <strong>input phosphor</strong>) is a component of the <a href="/articles/image-intensifier">image intensifier</a> in <a href="/articles/fluoroscopy">fluoroscopic systems</a> that converts the energy from x-rays into light photons. It is composed of a fluorescent material such as caesium 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 <a href="/articles/photocathode">photocathode</a> layer.</p><p>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, favourable atomic number and vertical orientation of crystals.</p>
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