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Method and appts. for gamma radiation detection imaging

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

Inactive Publication Date: 2006-07-26
谢舒平 +2
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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

Method used

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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] In the gamma ray detection and imaging method proposed by the present invention, a photocathode is first evaporated on the surface of the scintillation crystal array; the gamma ray is incident on the above-mentioned scintillation crystal array in parallel, so that the crystal emits scintillation light; The cathode material acts to generate photoelectric effect and excite photoelectrons; collect photoelectrons and export them along the normal direction of the crystal surface; amplify the gain of exported photoelectrons and collect the amplified pulse voltage signal; calculate gamma from the pulse voltage signal The energy and spatial position of the ray, the energy of the gamma ray is proportional to the magnitude 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 one embodiment of the present invention, use such as Image 6 For the detection imaging anode shown, let the...

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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 gamma ray detection and imaging method and device, belonging to the technical field of radiation detection and imaging. Background technique [0002] The traditional gamma ray detection technology usually adopts a structure with scintillation crystal as detection material and photomultiplier tube as signal amplifier, commonly known as scintillation detector. When the gamma ray is incident into the scintillation crystal, according to its energy range, photoelectric effect, Compton scattering effect and electron pair effect usually occur, and its own energy is finally absorbed by the crystal and releases extremely weak scintillation light at the same time. The scintillation light in the visible light region or ultraviolet light region can be detected by a high-sensitivity signal amplification device, that is, a photomultiplier tube after photoelectric conversion, to obtain all information of gamma rays, such as the intensity of...

Claims

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Application Information

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