A gas X-ray image intensifier

Abstract

A gas X-ray image intensifier, comprising: a readout anode plate (1); a microgrid electrode structure (2), formed by cascading n layers of microgrid electrodes (21) through a support structure (3), the support structure (3) fixed on the readout anode plate (1), wherein the support structure (3) is located at both ends of the microgrid electrode structure (2), between the microgrid electrodes (21) and between the microgrid electrodes (21) and the readout A gas avalanche amplification zone is formed between the anode plates (1), n ​​is an integer greater than or equal to 2; the incident window (4), which is formed above the micro-grid electrode structure (2), passes through the casing (6) and the readout anode plate (1) are connected, and the micro-grid electrode structure (2) and the support structure (3) are sealed; the drift cathode (5), which is formed on the inner surface of the incident window (4); wherein, the inside of the sealed structure is filled with Working gas for drift and avalanche multipliers. The magnification of light intensity of the device and the conversion efficiency of X-rays are high, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of microstructure gas detectors and X-ray imaging, in particular to a gas X-ray image intensifier. Background technique [0002] X-ray image intensifier (XRII) is an important component based on X-ray imaging equipment. It can convert X-rays into visible light and increase its intensity several times, which is much higher than that of fluorescent screen alone. XRII typically consists of a low absorption and scattering input window (usually aluminum or beryllium), a phosphor crystal for X-ray conversion, a photocathode, an electron focusing structure, and an output phosphor screen and output window. The XRII with this field-focusing structure will cause image distortion due to the existence of the focusing electric field. In order to solve this problem, microchannel plate (MCP) technology came into being. However, limited by the existing MCP process technology, the size of the MCP is still small and the pri...

AI Technical Summary

Problems solved by technology

Although the total light intensity of the device is highly amplified, the generated fluorescence has no directionality, so the effective light intensity that can reach the back-end image acquisition module is still limited

In the GEM cascading scheme, the electroluminescent light collection plane is on the lower surface of the last layer of GEM, only the holes can generate fluorescence, while other areas will constitute the imaging background image, which cannot be removed. Similarly, Micromegas’s The location of the micromesh support structure also fails to fluoresce, creating dead zones in the output image

In addition, the X-ray conversion efficiency of the gas environment will be lower than that of solid fluorescent crystals, and the method of increasing the thickness and pressure of the conversion gas has limited improvement on this problem

Images