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Gas ionization type middle-low-energy X.gamma-ray detector

A technology of gas ionization and γ-rays, which is applied in γ-ray measurement and control or imaging system detectors, and in the field of low- and medium-energy X-rays. It can solve the problems of large dark current, extreme temperature sensitivity, and short irradiation life, and achieve small dark current and long working life. Long life and good environmental adaptability

Active Publication Date: 2008-10-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this type of detector is: the dark current is large (~1×10 -10 A), extremely sensitive to temperature (strictly avoid light when used), short irradiation life, poor stability and reliability, etc.
This causes many difficulties in industrial applications, for example, to overcome its temperature effect, complex techniques have to be adopted to cool and stabilize the temperature of the detection device in protruding gauges of hot-rolled steel sheets

Method used

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  • Gas ionization type middle-low-energy X.gamma-ray detector
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  • Gas ionization type middle-low-energy X.gamma-ray detector

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Embodiment

[0034] 1. A sector-shaped one-dimensional array detection device:

[0035] The "thin-window cylindrical ionization chamber" is cylindrical, its metal thin window is made of 0.1mm stainless steel sheet, the wall of the ionization chamber is a Φ10×1mm seamless stainless steel tube, the length is 12cm, the central collector is a Φ2×0.2mm stainless steel tube, and the end cap Also made of stainless steel.

[0036] The thin metal window and the wall of the tubular ionization chamber are fixed by hydrogen furnace silver welding (using 72:28 silver-copper alloy solder). The hydrogen furnace silver welding is also used between the end cover and the metal-ceramic sealing insulator, and the argon arc welding is used between it and the wall of the tubular ionization chamber.

[0037] The ionization chamber is filled with Xe-CO at 3 MPa pressure 2 Mixed gas, the detection efficiency of X and γ photons with an average energy of 60keV will reach about 80%.

[0038] Arrange 128 such "thin...

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Abstract

This invention relates to a detector technology used in low-middle energy X and gamma ray test control or image system characterizing that a tubular ionization chamber contains a wall as the high voltage pole and central metal tubule as the collector, the end part of the chamber has an end cover sealed by a metal-ceramic sealing insulator and leading out signals, the inside of the ionization chamber is filled with working gas with inert gas as the main component, the tail of the chamber is sealed by thin metal window allowing low and middle energy X and gamma photon to inject.

Description

Technical field: [0001] The gas ionization type medium and low energy X and γ-ray detector belongs to the technical field of nuclear technology application, and relates to the technical field of detectors used for medium and low energy X and γ ray measurement and control or imaging systems. Background technique: [0002] Today's industrial nuclear measurement and control systems, such as the "camber meter" that detects the thickness distribution of steel plates online, need to use an array detection device that can detect the spatial distribution of medium and low energy X and γ rays. Different from medical CT or fine non-destructive testing equipment, the spatial resolution requirements of the above measurement systems are relatively low, and the pixel size of the array detection device used is relatively large, generally in the sub-centimeter order (for example: 5-10mm). Array detectors commonly used in industrial nuclear measurement and control systems at present are arra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B15/00G01B15/02G01N23/00
Inventor 安继刚王立强
Owner TSINGHUA UNIV