A Continuously Adjustable Circular Aperture Gamma Collimator
A gamma collimator and collimator technology, which is applied in the field of collimator shielding gamma rays, can solve the problems of troublesome adjustment, inability to realize continuous and fast adjustment, time-consuming and labor-intensive problems, and achieve easy installation and disassembly, and control accuracy High, improve the effect of experimental efficiency
Active Publication Date: 2017-12-15
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology
The adjustment of the aperture is realized by processing sleeves of various sizes, and continuous and quick adjustment cannot be realized
In addition, when it is necessary to limit the size of the beam spot on the ray source, this method is cumbersome to adjust. It is necessary to process a series of collimator sleeves of various sizes in advance, which is time-consuming and laborious.
Method used
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Embodiment 1
[0029] The inner curvature radius of the shielding substrate is Ф60, the outer curvature radius is Ф80, and the corresponding angle of the inner arc is 140°. The material of the shielding substrate is W, and the thickness is 1mm. The outer diameter of the base is Ф80, the inner diameter is Ф60, the material is stainless steel, the thickness is 15mm, and there are 10 grooves at the same interval. Each shielding substrate group corresponds to 10 shielding substrates. 20 such shielding substrate groups are connected in series front and back, the side opening of the collimator cylinder is opened, and 20 drive rods extend out of the side opening and are connected through linkage rods. Using stepper motor, linkage rod, and drive rod for rotation control, the continuous adjustment of the aperture less than 60mm can be realized.
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The invention relates to a continuously-adjustable-aperture round-hole gamma collimator, which comprises a collimator drum body, a plurality of shielding units and a linkage mechanism, wherein the plurality of shielding units are arranged in the collimator drum body; each shielding unit comprises an annular rotary base and a plurality of circular-arc-shaped shielding substrates; driving slots which are the same as the shielding substrates in quantity are formed in the rotary base; the inner and outer diameters of the shielding substrates are consistent with those of the rotary base, and the radian range of the shielding substrates is from 100 to 160 degrees; a base-fixing post is arranged on the lateral surface at one end part of each shielding substrate, and a drum-body fixing post is arranged on the opposite lateral surface at the other end part of each shielding substrate. According to the continuously-adjustable-aperture round-hole gamma collimator, collimated aperture adjustment is realized through the rotation of the rotary base, and the collimator only needs to be once installed without repeatedly machining or installing a plurality of groups of collimators with a series of apertures for many times.
Description
technical field [0001] The invention relates to a collimator for shielding gamma rays, specifically for the measurement of the activity (or intensity) of various gamma ray sources, the calibration of gamma ray detectors, etc. Collimator for beam limiting. Background technique [0002] A collimator is a shielding device or system used in radiation detection to shield wide-beam radiation (mainly including neutrons and gamma) to obtain narrow-beam radiation. Gamma ray collimator materials are generally composed of heavy metal materials such as Pb and W. The size of the collimation hole is generally designed according to the measurement requirements, and the shape of the collimation hole is generally a straight hole or a tapered hole. [0003] In the process of measuring the intensity of the ray source with a gamma ray detector, in order to make the signal reaching the sensitive area of the detector an effective incident signal, it is necessary to limit the gamma ray to overc...
Claims
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IPC IPC(8): G21K1/04
CPCG21K1/046
Inventor 翁秀峰谭新建黎春华杜宏亮孙彬付竹明张小东刘军
Owner NORTHWEST INST OF NUCLEAR TECH