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Procedure to obtain Gd2O2S: Pr for ct with a very short afterglow

A technology of short afterglow and gd2o2s, which is applied in detectors for detecting ionizing radiation, detecting ionizing radiation, and manufacturing fluorescent ceramics, and can solve problems such as unwanted afterglow characteristics

Active Publication Date: 2011-09-07
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] However, the inventors found that Gd containing europium 2 o 2 S:Pr fluorescent ceramics can show unwanted increased afterglow properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The initial rough material Gd with a particle size of 5 μm 2 o 2 S: 700wt.ppm Pr: 25wt.ppm Ce and 0.5wt.ppm Eu were subjected to uniaxial hot pressing under a vacuum of 1Pa. The pressing temperature is 1250°C, the pressure is 200MPa, and then annealed in air at about 1000°C for 2 hours.

[0090] The obtained fluorescent ceramic material exhibits an afterglow characteristic of about 10 ppm at 0.5 s.

[0091] The fluorescent ceramics according to the invention can be used, for example:

[0092] scintillation or fluorescent components for detecting ionizing radiation, preferably x-rays, gamma rays and electron beams; and / or

[0093] Apparatus or equipment for use in the medical field, preferably computerized scanning (CT).

[0094] Most preferably, at least one fluorescent ceramic according to the invention can be used in detectors or instruments suitable for medical imaging.

[0095] However, fluorescent ceramics can be used in any detector known in the medical field...

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Abstract

The present invention is directed to a Gd2O2S: M fluorescent ceramic material with a very short afterglow, wherein M represents at least one element selected from the group Pr, Tb, Yb, Dy, Sm and / or Ho and the Gd2O2S: M fluorescent ceramic material comprises further: europium of = 1 wt. ppm based on Gd2O2S, and cerium of = 0.1 wt. ppm to = 100 wt. ppm based on Gd2O2S, wherein the content of cerium is in excess of the content of europium with a ratio of europium to cerium of 1 : l0 to l : 150.

Description

technical field [0001] The invention is used for europium-contaminated gadolinium-containing powder and europium-contaminated fluorescent ceramics. [0002] The invention further relates to a method for producing fluorescent ceramics using uniaxial hot pressing. [0003] The invention also relates to a detector for detecting ionizing radiation. [0004] The invention also relates to the detection of ionizing radiation using said detector. [0005] Phosphors used to detect high-energy radiation contain phosphors that absorb the radiation and convert it into visible light. The fluorescence emission resulting therefrom is acquired and evaluated electrically with the aid of a photosensitive system such as a photodiode or photomultiplier tube. These phosphors can be prepared from single crystal materials, for example, doped alkali halides. Non-monocrystalline materials can be used as powdered phosphors or in the form of ceramic compositions prepared therefrom. Background tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/77G21K4/00
CPCC09K11/7771G21K4/00C04B2235/786C04B35/64C04B35/645C04B2235/6581C04B2235/3229C04B2235/3224C04B35/547C04B2235/662
Inventor C·R·朗达G·泽特勒D·沃多H·韦科雷克H·施赖尼马彻
Owner KONINK PHILIPS ELECTRONICS NV
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