Method and appts. for gamma radiation detection imaging

A gamma ray and imaging technology, applied in the field of gamma ray detection and imaging, can solve the problems of low spatial resolution, high cost, and large imaging volume of the detector, and achieve the effect of easy production and low cost

Inactive Publication Date: 2005-01-12
谢舒平 +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the traditional scintillation detector needs to use a large number of independent photomultiplier tubes to couple a group of scintillation crystal arrays for positioning analysis when performing imaging, and there is a large detection dead zone between the photomultiplier tubes, so that the entire detector imaging are large in size, high in cost, and relatively low in spatial resolution

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  • Method and appts. for gamma radiation detection imaging
  • Method and appts. for gamma radiation detection imaging
  • Method and appts. for gamma radiation detection imaging

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Embodiment Construction

[0038] The gamma-ray detection and imaging method proposed by the present invention first vaporizes a photocathode on the surface of the scintillation crystal array; the gamma rays are incident parallel to the scintillation crystal array to make the crystal emit scintillation light; when the scintillation light is emitted from the end face of the crystal Cathode material acts to generate photoelectric effect to excite photoelectrons; collect photoelectrons and lead photoelectrons along the normal direction of the crystal surface; perform gain amplification on the exported photoelectrons to collect the amplified pulse voltage signal; calculate the gamma from the pulse voltage signal The energy and spatial position of the ray, the energy of the gamma ray is proportional to the size of the pulse voltage signal, and the spatial position of the gamma ray is equal to the position where the pulse voltage signal is generated.

[0039] In an embodiment of the present invention, use such as...

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Abstract

Photocathode is coated by vaporization on surface of scintillating crystal array. Crystal array emits scintillating light caused by gamma rays. Photoelectrons are excitated under action between scintillating light and photocathode material. Photoelectrons are collected and exported. After gain amplification of the signal, Energy and spatial location of gamma rays are calculated from signal of impulse voltage. In the equipment, scintillating crystal array is placed in insulated bracket in vacuum chamber. Photocathode is on one side of the scintillating crystal array, and grid electrode is led out. Microchannel plate and imaging anode are in on another side of photocathode. One end of leading out cable is connected to imaging anode, and the other end is out of vacuum envelope. Features are high resolution in space and energy, and compact size.

Description

Technical field [0001] The invention relates to a method and device for gamma ray detection and imaging, and belongs to the technical field of radiation detection and imaging. Background technique [0002] Traditional gamma-ray detection technology usually uses a structure that uses a scintillation crystal as a detection material and a photomultiplier tube as a signal amplifier, which is generally called a scintillation detector. When gamma rays are incident into the scintillation crystal, according to its energy range, it usually produces photoelectric effect, Compton scattering effect and electron pair effect, and its own energy is finally absorbed by the crystal while emitting extremely weak scintillation light. For the scintillation light in the visible light region or the ultraviolet light region, after photoelectric conversion, a high-sensitivity signal amplifying device, namely a photomultiplier tube, can be used to detect all the information of gamma rays, such as the int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/202
Inventor 谢舒平刘亚强谢立平
Owner 谢舒平
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