Novel cesium iodide scintillation screen

A cesium iodide and scintillation screen technology, which is applied in the direction of conversion screen, photography technology, X-ray/infrared technology, etc., can solve the problems affecting the MTF value of the scintillation screen, the complex preparation process of the scintillation layer, and the reduction of image contrast, etc., to achieve excellent MTF value, unique features, and the effect of ensuring stability

Inactive Publication Date: 2014-04-02
江苏龙信电子科技有限公司
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Problems solved by technology

[0003] During the working process of the cesium iodide scintillation screen, there is a certain scattering phenomenon in the fluorescent conversion layer, which easily affects the MTF value of the scintillation screen and reduces the contrast of the image
In order to ensure a good contrast of the image, in the current technology, a stabilizer thallium iodide is often added to the cesium iodide raw material, and after mixing, the scintillation screen is prepared through a thermal evaporation process, but the above process does not affect the mixing percentage of the raw material, heating, cooling and heating. The control requirements of the evaporation time are very strict, and the preparation process of the scintillation layer is relatively complicated, and the preparation cost is high

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  • Novel cesium iodide scintillation screen

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Embodiment

[0017] Concrete preparation process is as follows:

[0018] a) Select the bottom layer, the bottom layer is made of glass or optical fiber panel, and its thickness is about 1.5-1.8mm; the bottom layer needs to be cleaned ultrasonically before use, and then dried after cleaning;

[0019] b) Prepare the cesium iodide layer. The cesium iodide layer is prepared by vacuum thermal evaporation process. The preparation process is as follows: first, weigh the cesium iodide powder quantitatively, and place the powder in the evaporation boat, and the evaporation boat and the bottom layer The distance between them is controlled at 15-20cm; then, the evaporation chamber is evacuated, and the vacuum degree is controlled at 10 -10 torr, the bottom layer is heated to 220°C-240°C with electric heating wire; then, turn on the power of the evaporation boat, and after the temperature of the evaporation boat rises to 440°C-480°C, argon gas is introduced, and the airflow velocity of argon gas is...

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Abstract

The invention discloses a novel cesium iodide scintillation screen. The cesium iodide scintillation screen comprises a bottom layer and a scintillation layer; the scintillation layer consists of a cesium iodide layer and a thallium iodide layer; the thallium iodide layer is coated upon the cesium iodide layer. The invention discloses the novel cesium iodide scintillation screen. The scintillation screen has reasonable structural design and unique functions; the scintillation layer of the novel cesium iodide scintillation screen uses cesium iodide as a photovoltaic conversion medium and is coated with thallium iodide; the structural design effectively ensures stability of the scintillation screen in the fluorescence conversion process, avoids generating a scattering effect and enables the scintillation screen to have a more excellent MTF (Modulation Transfer Function) value, a higher image contrast and clearer and more reliable image quality.

Description

technical field [0001] The invention relates to a cesium iodide scintillation screen, in particular to a novel cesium iodide scintillation screen which can effectively improve fluorescence conversion efficiency and quality, and belongs to the technical field of cesium iodide scintillation screen. Background technique [0002] Since X-ray was discovered by Roentgen, its use has become more and more extensive, from the initial X-ray photosensitive photo to later X-ray photodetection devices, from aerospace to high-energy physics, from military to medical to security equipment, from From production to life to scientific research and exploration of the universe, this kind of ray is showing its unique charm more and more. Inorganic scintillator materials play a very important role in X-ray radiation detection and are widely used in imaging nuclear medicine, nuclear physics, high-energy physics, CT and security inspection and other fields. The most researched and applied inorgani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21K4/00G01T1/20
Inventor 范波
Owner 江苏龙信电子科技有限公司
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