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US 7,608,836 B2Granted
X-ray detector with CsI:T1 conversion layer
AssigneeKoninklijke Philips Electronics N.V.
InventorHerfried Karl Wieczorek
Life of this patent
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Abstract
An x-ray detector comprises a conversion layer for converting x-radiation into optical radiation. Photosensitive elements notably photodiodes to derive electronic signals from the optical radiation received by the photosensitive elements. The conversion layer contains Caesium-iodide doped with Thallium (CsI:Tl); the Caesium-iodide doped with Thallium is ultrapure and the Tl-doping level is in the range of 0.25-1.00 at %.
Claims21
A method of forming an x-ray detector, the method comprising the steps of:
- providing a plurality of photosensitive elements to generate electronic signals from optical radiation;
- disposing alternate layers of CsI and TlI to form a conversion layer that is spatially homogeneous, the conversion layer being configured to convert x-rays into optical radiation in the range of about 400 to 700 nanometers, the conversion layer comprising cesium iodide doped with TlI, which includes from 0.25% to 1% of thallium and from one to 100 parts per million of indium;
- and
- connecting the conversion layer to the plurality of photosensitive elements using an optical adhesive that is in contact with a surface of each of the conversion layer and the plurality of photosensitive elements.
1 more element
An x-ray detector comprising:
- a plurality of photosensitive elements to generate electronic signals from optical radiation;
- and
- a conversion layer to convert x-rays into the optical radiation in the range of about 400 to 700 nanometers, the conversion layer comprising cesium iodide doped with TlI with from 0.25% to 1% of thallium and from one to 100 parts per million of indium, the conversion layer being connected to the plurality of photosensitive elements by an optical adhesive that is in contact with a surface of each of the conversion layer and the plurality of photosensitive elements.
A method for forming an x-ray detector, the method comprising the steps of:
- forming a matrix of photosensitive elements to generate electronic signals from optical radiation;
- forming a conversion layer by co-evaporating CsI and TlI, the conversion layer being spatially homogeneous and configured to convert x-rays into optical radiation in the range of about 400 to 700 nanometers, the conversion layer comprising cesium iodide doped with TlI with from 0.25% to 1% of thallium and from one to 100 parts per million of indium;
- and
- connecting the conversion layer to the matrix of photosensitive elements.
1 more element
Dependencies are inferred from the claim text.