High-energy X-ray industrial CT ionization detector

Abstract

The invention provides a high-energy X-ray industrial CT ionization detector, which can overcome the defects of scintillator detectors and is suitable for radiation detection of a high-energy X-ray industrial CT system. The detector comprises seal housing which is filled with working gases and is provided with a plurality of ionization chamber units; the ionization chamber unit is elongated and comprises a U-shaped ionization chamber wall and a latten; a receiving terminal of the X-ray on the latten is fixedly arranged at an open end of the U-shaped ionization chamber wall via an insulation sheet; the other end of the latten is arranged in the ionization chamber and spread along the length direction of the ionization chamber; the latten, with thickness less than or equal to 0.3mm, is manufactured by high-density metals with high atomic number or the alloy of the metals; a coat on which secondary electrons are easily generated covers the external surface of the latten; the U-shaped ionization chamber wall is connected with a signal processing circuit as a collector; the latten is connected with a high-voltage cathode and a high-voltage power supply as a radiation converter.

Description

technical field [0001] The invention relates to the application field of nuclear technology, in particular to an X-ray detector. Background technique [0002] At present, the detectors used in high-energy and high-precision X-ray industrial CT usually use scintillator detectors, which are usually composed of photosensitive elements and scintillators. The photosensitive element is made of semiconductor material, usually single crystal silicon, polycrystalline silicon or amorphous silicon for CCD or CMOS type sensing. A photosensitive element has at least one photodiode, phototransistor or photoresistor. These components are deposited on a substrate. However, since the photosensitive element is not sensitive to short-wavelength X-rays, a scintillator is required to convert X-rays into longer-wavelength visible light, which is then converted by the photosensitive device into electrical signals collected by the corresponding circuit. Scintillators commonly used in high-energy...

AI Technical Summary

Problems solved by technology

The Chinese invention patent publication with publication number CN1936498A discloses a gas ionization type low-energy X, Γ-ray detector, including a tubular ionization chamber, including a tubular ionization chamber wall as a high-voltage pole, and a central metal thin tube as a collector. The end of the tubular ionization chamber has an end cover, and the end cover is sealed with a metal-ceramic fused insulator and the signal is drawn out. The inside of the tubular ionization chamber is filled with working gas with inert gas as the main component. The thin metal window where X and Γ photons are injected is sealed. This invention also uses gas as a radiation conversion body, which has low detection efficiency for high-energy accelerator X-rays, so it is not suitable for high-energy X-ray detection.

Images