Pre-plating layer auxiliary preparation method of X-ray flash conversion screen with micro-column structure CsI (Tl) and application thereof

Abstract

The invention relates to a pre-plating layer auxiliary preparation method of an X-ray flash conversion screen with a micro-column structure CsI (Tl) and an application of the conversion screen. The method comprises the following steps of: preparing a pre-plating layer by a thermal evaporation technology, realizing the pre-plating layer with uniformly distributed island grain structure and effectively controlling the grain distance through the adjustment of the thickness of the pre-plating layer, an annealing technology and the like, then preparing subsequent flash thin film on a substrate plated with the pre-plating layer by using CsI (Tl) powder as a raw material by the thermal evaporation, and realizing the effective controls on micro-column morphology, uniformity, line width, preferred orientation of a crystal face of the conversion screen and the like. The flash micro-column which is nearly vertical to a screen surface and has good crystallization property can guide flare light to spread along the direction of the micro-column, so that the spatial resolution of an X-ray image device is improved, and requirements on the high spatial resolution and high detection efficiency are met. The coupling of the X-ray flash conversion screen with the micro-column structure CsI (Tl) and a photoelectric detector can be applied to a digital X-ray imaging of high resolution. The pre-plating layer auxiliary preparation method of an X-ray flash conversion screen with the micro-column structure CsI (Tl) is suitable for industrial production and is high in popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of high-resolution digital X-ray imaging, and specifically relates to a pre-coating auxiliary preparation method and application of a microcolumn structure cesium iodide (thallium-doped) [chemical formula: CsI(Tl)] X-ray scintillation conversion screen, The prepared scintillation conversion screen can meet the X-ray imaging requirements of high spatial resolution and high detection efficiency at the same time. Background technique [0002] X-ray imaging has a wide range of applications in crystallography, medicine and life sciences, plasma diagnostics, non-destructive testing, and astrophysics. In recent years, the digital recording of X-ray images has gradually replaced the traditional photosensitive film for image recording due to its advantages of convenience, quickness, storage, transmission and image processing. [0003] The commonly used X-ray digital imaging system is composed of a scintillation conv...

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Problems solved by technology

However, the film prepared by thermal evaporation is usually disordered at the bottom of the film, without a very obvious microcolumn structure, which is mainly caused by the lattice mismatch between the film and the substrate. Aiming at this phenomenon, since 2004, A. Ananenko et al. studied the preparation of CsI(Tl) microcolumn films on the (100) crystal plane of single crystal LiF to reduce the degree of lattice mismatch, and obtained CsI with two preferred crystal plane orientations (110) and (112). (Tl) microcolumnar films, which they believe is due to the smallest lattice mismatch between the two orientations of the film and the (100) crystal plane of LiF

[0005] Looking at the research status at home and abroad, although there have been reports abroad on the development of CsI(Tl) X-ray conversion screens with micro-column structures, the methods mainly involve evaporation temperature, substrate temperature, etc. , microcolumn morphology, line width control ability and other aspects need to be further strengthened; and the corresponding research has not yet been systematically carried out

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