Radioactive material detecting device
A radioactive material and detection device technology, applied in the field of ray detection, can solve the problems of large dead zone, large volume and poor uniformity of the detector, and achieve the effects of improving detection accuracy, improving light output rate and facilitating detection
Pending Publication Date: 2019-02-15
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0003] The detector in the existing passive detection device adopts the design scheme of scintillator single-ended coupled photomultiplier tube with a central opening, such as the project entitled "A gamma probe and probe system for fuel rod abundance detection". Chinese patent application CN106596496A discloses the use of a photomultiplier tube to receive the fluorescent signal from a scintillator. The scintillation light output by a single end consumes more, and the uniformity of the light output is also poor, which is not conducive to gamma-ray energy spectrum analysis, and cannot guarantee analysis. precision of results
At the same time, because the photomultiplier tube is limited by its own structure, the volume is usually large (the area of the light receiving surface is greater than 20mm*20mm), it is difficult to inspect a single fuel pellet, and the dead zone of the detector caused by the parallel stacking arrangement is also large
In addition, the photomultiplier tube must be equipped with a corresponding high-voltage power supply to work normally, which increases the complexity of use
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[0030] In order to facilitate those skilled in the art to understand the basic principles of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and the present invention is not limited to the precise form of these exemplary embodiments. In addition, the elements in the drawings are not necessarily drawn to scale. For example, the size of some elements in the figure may be enlarged relative to other elements to help improve the understanding of the embodiments of the present invention.
[0031] figure 1 It is a schematic diagram of a radioactive material detection device according to the first embodiment of the present invention. Such as figure 1 Said detection device includes a scintillator 1 with a hollow annular integral structure, a plurality of ph...
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The invention relates to a radioactive material detecting device. The device comprises a scintillator, a plurality of photoelectric conversion devices and a signal processing unit. The scintillator has a hollow annular integrated structure. The scintillator converts a ray emitted by a radioactive material into scintillation light. The plurality of photoelectric conversion devices are disposed on an outer peripheral surface of the scintillator for converting the scintillation light into an electrical pulse signal. The signal processing unit is used for processing the electric pulse signal. By the multi-end readout on the integrated structure of the annular scintillator, the light output of the annular scintillator can be improved, and the light output uniformity can be improved.
Description
Technical field [0001] The present invention generally relates to the field of radiographic detection technology, and more particularly to a detection device and a detection method for passive detection of the enrichment degree of nuclear fuel pellets. Background technique [0002] Nuclear fuel rods are a key component of nuclear power plant reactor fuel assemblies. The most basic unit is uranium dioxide (UO 2 ) Fuel pellets. The enrichment degree of nuclear fuel pellets refers to the 235 The mass fraction of U, uneven enrichment of nuclear fuel pellets or mixing with abnormal pellets will cause uneven heating of nuclear fuel rods, reduce use efficiency, and even cause nuclear fuel rods to rupture, leading to shutdown and major accidents. Therefore, nuclear fuel rods must be tested one by one before they are used in the factory. Current nuclear fuel pellet enrichment detection methods can be divided into two types: active method and passive method. Active method adopts slowed d...
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IPC IPC(8): G01T1/36G01T1/20G01T1/208G01T1/202
CPCG01T1/2002G01T1/202G01T1/208G01T1/362
Inventor刘彦韬王英杰杨明洁魏龙章志明魏存峰李道武刘双全王培林王晓明姜小盼帅磊黄先超张译文
OwnerINST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI