PMT Array with Varying Sizes for Gamma Detection
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Solution Overview
Problem
Conventional scintillation detectors have non-uniform detection efficiency and low spatial resolution due to large blind areas between photomultiplier tubes, limiting their effectiveness in high energy radiation detection and imaging.
Innovation Solution
A combined method using a scintillation crystal array bonded with an optical adhesive to a PMT array of different sizes, where a small PMT is centered among larger ones, enhancing light collection and reducing blind areas for improved detection efficiency and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional scintillation detectors use identical photomultiplier tubes arranged in a regular array, then the structure is simple and easy to manufacture, but large blind areas exist between the photomultiplier tubes resulting in non-uniform detection efficiency and low spatial resolution
Solution Approach 1:
The patent applies local quality by using photomultiplier tubes of different sizes at different positions in the array. Specifically, corner PMTs have larger active areas to cover blind regions, while central PMTs have smaller active areas. This non-uniform configuration optimizes light collection efficiency at each location, eliminating blind spots between tubes and improving spatial resolution without requiring a completely complex redesign of the entire detector system.
2Productivity
If photomultiplier tubes are arranged with large gaps between them, then the device complexity is reduced and manufacturing is easier, but detection efficiency becomes non-uniform and spatial resolution decreases
Solution Approach 1:
The patent implements local quality by configuring PMTs with different active areas at different positions. Corner PMTs use larger active areas (e.g., 2.5 inches) to cover blind regions created by gaps, while central PMTs use smaller active areas (e.g., 1.5 inches). This position-dependent configuration maintains high detection efficiency across the entire detector surface while managing the complexity of the PMT arrangement through a systematic design pattern.
3Reliability
If identical photomultiplier tubes are used throughout the detector array, then manufacturing cost is reduced and ease of manufacture is improved, but blind areas between tubes create non-uniform detection efficiency
Solution Approach 1:
The patent applies local quality by selecting PMTs with different active areas based on their positions in the array. Corner positions use larger PMTs to cover blind regions, while central positions use smaller PMTs. This approach improves detection efficiency uniformity across the detector surface while maintaining reasonable ease of manufacture through a systematic, position-based selection criterion that can be implemented during assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in more uniform detection, higher spatial and energy resolution, rapid response, and a compact structure with reduced blind areas, enhancing imaging quality and detection efficiency while maintaining a lower cost compared to conventional detectors.
Implementation Method 1
scintillation crystals as a detection material which is capable to block radiation effectively and produce light by absorbing the energy of the radiation
Implementation Method 2
uses a high gain photomultiplier device to generate electrical pulse signals by photoelectrically converting and amplifying the weak optical signals
Implementation Method 3
photoelectric effect, Compton scattering effect and electron pair effect in different proportions will occur according to the value of the radiation energy
Implementation Method 4
photoelectric effect, Compton scattering effect and electron pair effect in different proportions will occur according to the value of the radiation energy
Data Source
AI summary
A combined method for detecting and positioning high energy radiation, belonging to the radiation detection and imaging technology field, comprises: arranging scintillation crystals for capturing high energy radiation into a regular array; assembling a plurality of PMTs with different sizes into a combined array where smaller PMT is located at the center of larger PMTs; forming a combined high energy radiation detector by bonding the scintillation crystal array and the combined PMT array with an optical adhesive; when a high energy gamma ray is incident into the scintillation crystal array, scintillation light is generated and amplified by the combined PMT array into electrical pulse signals; then obtaining the position coordinates, energy and time of the high energy gamma ray by processing the electrical pulse signals. The method provides more effective and uniform high-energy radiation detection, has higher spatial and energy resolution, and simultaneously has high-speed response.