Composite crystal, gamma ray detector and their preparation methods

A composite crystal and gamma ray technology, which is applied in chemical instruments and methods, crystal growth, radiation measurement, etc., can solve the problems of spectroscopic limitation at the bottom of the scintillation crystal and the decrease of detector resolution, etc., and achieve high repeatability, High spatial resolution, easy to produce effects

Inactive Publication Date: 2012-11-21
SHANGHAI RES CENT OF BIOMEDICAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of detector has a strong light-splitting ability, and there is no Figure 1b However, in this type of detector, the light splitting in the bottom area of ​​the scintillation crystal is limited, resulting in a decrease in the overall resolution of the detector

Method used

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  • Composite crystal, gamma ray detector and their preparation methods
  • Composite crystal, gamma ray detector and their preparation methods
  • Composite crystal, gamma ray detector and their preparation methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a composite crystal for gamma ray detectors, the specific structure of the composite crystal is as follows Figure 2a to Figure 2d shown, where Figure 2a represents a large scintillation crystal, Figure 2b Indicates a bulk light guide, Figure 2c Shown are bulk composite crystals, Figure 2d Shown is a single composite crystal. Figure 2c Among them, the upper half of the large composite crystal is a scintillation crystal, and the lower half is a photoconductive material. The scintillation crystal and the photoconductive material are pasted together by a special adhesive to form a unified large composite crystal. After cutting, grinding and polishing, a single composite crystal for assembling the crystal array is obtained, that is, Figure 2d structure shown.

Embodiment 2

[0048] This embodiment provides a gamma-ray detector made of the composite crystal described in Embodiment 1, such as Figure 3a , Figure 3b and Figure 5bAs shown, the single composite crystals 5 are filled with reflective layers 9 of different lengths to form the composite crystal array 4 . The composite crystal array 4 is coupled together with the photomultiplier tube 3 through an optical coupling agent; the composite crystal array 4 includes a plurality of single composite crystals 5, and the single composite crystals 5 are filled with reflective light of different lengths. layer 9; the composite crystal array 4 is wrapped by a frame bracket 8; the single composite crystal 5 is obtained by cutting, grinding and polishing the composite crystal; the upper part of the single composite crystal 5 is a scintillation crystal 6, and the lower part is a light guide glass 7 (ie light-guiding material). This is similar to Figure 1b The traditional detector using the finger ligh...

Embodiment 3

[0052] In this embodiment, the spectroscopic performance of the gamma-ray detector described in Embodiment 2 is compared with that of a traditional gamma-ray detector, as Figure 4b As shown, the gamma ray detector described in the second embodiment can change the propagation direction of the flash by adjusting the length of the middle reflective layer, so as to realize intelligent guidance. Figure 4a The conventional gamma-ray detector shown cannot change the direction of propagation of the scintillation light, while Figure 1b Since the scintillation crystal and the light guide of the detector shown are independent, there are engineering uncertainties in coupling and alignment, resulting in a greatly weakened light-splitting ability.

[0053] Through the above comparison, it can be found that the advantages of the gamma ray detector described in Embodiment 2 are:

[0054] 1. High spatial resolution.

[0055] The spatial resolution of gamma-ray detectors is mainly based on...

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Abstract

The invention discloses a composite crystal, a gamma ray detector and their preparation methods. The gamma ray detector comprises a composite crystal array and a photomultiplier. The composite crystal array is coupled with the photomultiplier by an optical coupling agent. The composite crystal array comprises the multiple composite crystal wires and light reflective layers having different lengths are filled between the multiple composite crystal wires. The multiple composite crystal wires are cut, grinded and polished to form the composite crystal. The composite crystal comprises scintillation crystals and a photoconductive material. The scintillation crystals and the photoconductive material are bonded by an adhesive and are aligned with each other without deviation, wherein the adhesive is optical cement. The gamma ray detector provided by the invention has a high space resolution ratio. The preparation method of the composite crystal has simple processes, can be realized easily, and adopts a high-stability and high-repeatability assembling technology.

Description

technical field [0001] The invention belongs to the technical field of radiation detection and imaging, and relates to a detector, in particular to a composite crystal, a gamma ray detector and a preparation method thereof. Background technique [0002] Traditional gamma-ray detectors usually use a scintillation crystal as the detection material, and photoelectric conversion devices such as photomultiplier tubes as signal amplifiers, which are collectively called scintillation detectors. When gamma rays are incident into the scintillation crystal and absorbed by the scintillation crystal, the scintillation crystal will release extremely weak scintillation light. The scintillation light in the visible light region or ultraviolet light region can pass through the light collecting part (ie light guide) as much as possible to the photosensitive layer of the photomultiplier tube for photoelectric conversion, and finally form an electrical pulse signal at the output end after mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/06G01T1/202
Inventor 应关荣谢舒平
Owner SHANGHAI RES CENT OF BIOMEDICAL ENG
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