Novel cesium iodide scintillation screen

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...

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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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