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Arbitrary polygon beam generation method with adjustable area and corresponding gamma collimator

A gamma collimator and polygon technology, which is applied in the field of collimators, can solve the problems of time-consuming and laborious, troublesome adjustment, inability to realize continuous and quick adjustment, etc., and achieve the effect of improving experimental efficiency and high control precision.

Active Publication Date: 2017-05-03
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Arbitrary polygon beam generation method with adjustable area and corresponding gamma collimator
  • Arbitrary polygon beam generation method with adjustable area and corresponding gamma collimator
  • Arbitrary polygon beam generation method with adjustable area and corresponding gamma collimator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Square collimator with continuously adjustable aperture

[0046] Such as Figure 6 As shown, the substrate is a 5mm thick W plate, the outer dimension of the substrate is 20cm×20cm, the incision is an isosceles right triangle, the height is 5cm, the distance between substrates is 6mm, and the number of substrates is 30. There are two groups of shielding substrates, which are arranged in a staggered manner, and the central planes of the cutouts are coplanar. The stepping motor unit pushes the two groups of shielding substrates to move to the center of the collimation hole at the same time, so as to ensure that the shape of the aperture remains unchanged. Aperture adjustable range is Ф0.1 ～ Ф70.

Embodiment 2

[0047] Embodiment 2: Aperture Continuously Adjustable Regular Hexagonal Collimator

[0048] Such as Figure 7 As shown, the shielding substrate is a 5mm thick W plate, the outer size of the substrate is 20cm×20cm, the incision is an isosceles triangle with a vertex angle of 120 degrees, the height of the triangle is 5cm, the substrate spacing is 15mm, and the number of substrates is 30. There are 3 groups of shielding substrates arranged in a staggered manner, and the center plane of the cutout of each group of shielding substrates is 120 degrees apart. The stepping motor unit pushes the three groups of shielding substrate groups to move to the regular hexagonal collimation hole at the same time, stepping the same displacement to realize the adjustment of the aperture size.

[0049] The structure without notches on the substrate is similar to the above embodiment, but the layout is different. It is only necessary to form corresponding graphic vacancies on the sides of multip...

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PUM

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Abstract

The invention relates to an adjustable-area freeform beam generation method and an adjustable-area freeform gamma collimator. A plurality of substrates (the number of the substrates equals shielding required maximum thickness divided by thickness of the single substrate) are staggered and combined; a gap of the substrates in each layer is greater than the thickness of one layer of the substrates; the staggered substrates are connected together through a side plate to obtain a shielding substrate unit; in the case of a square collimating hole, two shielding substrate units are provided; in the case of a regular hexagonal collimating hole, three shielding substrate units are provided. Collimating aperture is adjusted through translation of the shielding substrate units, single mounting of the collimator is required only, and multiple mounting of multi-row aperture calibrator by repeated processing is avoided.

Description

technical field [0001] The invention relates to a method for generating an arbitrary polygonal light beam with adjustable area and a collimator for shielding gamma rays, specifically for measuring the activity (or intensity) of various gamma ray sources, calibrating gamma ray detectors, etc. A collimator that shields against background scatter and beam-limits incident gamma rays. 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 sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21K1/02G21K1/04
CPCG21K1/025G21K1/04
Inventor 谭新建翁秀峰杜宏亮黎春华付竹明张小东刘军孙彬
Owner NORTHWEST INST OF NUCLEAR TECH