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High-energy X-ray industrial CT ionization detector

An X-ray and ionization-type technology, applied in the field of nuclear technology applications, can solve the problems of low detection efficiency of high-energy accelerator X-rays, and achieve the effects of volume reduction, lower processing precision requirements, and reduced crosstalk

Inactive Publication Date: 2009-09-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

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Embodiment Construction

[0024] Preferred embodiments of the present invention will be described in detail below.

[0025] see figure 1 , figure 2 , the high-energy X-ray industrial CT ionization detector of this embodiment includes a sealed casing 1, and the inner cavity of the sealed casing 1 is filled with a pressure of 1 to 5×10 5 Pascal’s working gas with inert gas as the main component, such as argon, krypton, xenon, etc. or a mixed gas based on them, the sealed casing 1 is provided with an inlet pipe 11 and an outlet pipe 12 communicating with the inner cavity, Eight ionization chamber units 2 arranged side by side in the sealed housing 1 and separated by insulating sheets 6, the ionization chamber units 2 include a U-shaped ionization chamber wall 21 as a collector and a thin wall as a high-voltage cathode and a radiation converter. Metal sheet 22, the U-shaped ionization chamber wall 21 is made of aluminum, iron, nickel, copper or an alloy of at least two of them, and the thin metal sheet ...

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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...

Claims

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Application Information

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IPC IPC(8): G01T1/185
Inventor 周日峰高富强张平谭辉安康陈伟民
Owner CHONGQING UNIV
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