Gas scintillation proportional counter

Abstract

The invention provides a gas scintillation proportional counter, consisting of a gas container and a photomultiplier tube, wherein the gas container is filled with working gas; an entrance window and an exit window are respectively arranged above and under the gas container which is internally provided with an electric field; Gamma ray or X ray enters the gas container after penetrating the entrance window, and has a photoelectric effect with the working gas in the gas container so as to generate photoelectrons; under the action of the electric field, the electrons are accelerated by the electric field, then excite gas atoms to emit vacuum ultraviolet photons which are emitted from the exit window and detected by the photomultiplier tube, and the upper part of the exit window is a wavelength conversion structure. The gas scintillation proportional counter can meet the need of measurement of internal radiation living bodies after the body intakes low-energy nuclide, and can detect the returned laser of the working gas by only needing to use the common photomultiplier tube, thus greatly reducing the cost of the gas scintillation proportional counter.

Description

technical field [0001] The invention belongs to the technical field of radiation detection, in particular to a gas scintillation proportional counter for detecting low-energy gamma rays or X-rays. Background technique [0002] In nuclear fuel cycle, radioisotope production, decommissioning of nuclear facilities and application of nuclear technology and other production practices, workers receiving occupational exposure may be exposed to internal exposure due to ingestion of radionuclides, so corresponding radiation protection measures must be taken as a guarantee . [0003] When the human body ingests low-energy radioactive transuranic nuclides such as americium and plutonium, the γ-rays emitted by these nuclides have very low energy and will be seriously absorbed and scattered by the human body. In the measurement, the detector is required to have a high detection efficiency; the lower limit of the detectable energy; in order to identify the nuclide, the detector is requir...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is a technical problem that the working gas, such as Xe, has a center wavelength of 172nm for the de-laser, which is in the vacuum ultraviolet band (100-200nm), and the photomultiplier with better response to the photons in the vacuum ultraviolet band Tubes, photodiodes and other device processing and manufacturing processes are very difficult to achieve

This also resulted in a substantial increase in the cost of gas scintillation proportional counters

In the article "Gas Scintillation Proportional Counter: GSPC" (Nuclear Electronics and Detection Technology, 2005, No. 6), the author pointed out that the use of wavelength shifting optical fiber, or Xe-Kr-He mixed gas (P 666 , lines 8-10) can solve this technical problem, but the actual situation is that the above two solutions cannot achieve the purpose of converting the wavelength of vacuum ultraviolet light into visible light wavelength. In addition, the article also pointed out that gas scintillation is proportional to The inner wall of the counter generally needs to be coated with MgO as a reflective material, and then coated with a wavelength conversion material on the MgO to match the light wavelength with the photomultiplier tube (P 666 , lines 35-37), however, if the wavelength conversion material is coated, it is also difficult to realize, and this article has not disclosed the specific content and use method of the wavelength conversion material

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