Radiation Detector Stacked Barrier Layers Block X-Ray Noise
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Solution Overview
Problem
Radiation detectors in radiographic systems face issues as some X-rays bypass the scintillator and directly impact electronics or circuitry, leading to noise and performance degradation due to unabsorbed radiation.
Innovation Solution
The implementation of stacked barrier layers with high Z material-filled vias within an electrical substrate, positioned between the photodetector layer and signal electronics, to absorb and block incident radiation, thereby reducing the amount of radiation reaching the circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the scintillator layer is divided into discrete pixels using dividers, then the detector can detect spatial distribution of radiation, but some X-rays pass through the dividers without being absorbed and reach the electronics
Solution Approach 1:
Barrier layers are introduced as intermediary structures between the scintillator layer and the electronics. These barrier layers contain high-Z materials (such as tungsten, lead, or bismuth) that effectively absorb and block the X-rays that pass through the scintillator dividers, preventing them from reaching and damaging the underlying electronics while allowing the detector to maintain its spatial detection capability.
Solution Approach 2:
The barrier layers are constructed using composite materials combining high-Z radiation-absorbing materials with electrically conductive materials. This composite structure provides dual functionality: the high-Z material absorbs X-rays to protect electronics, while the conductive material maintains electrical connectivity and signal transmission from the photodetector elements to the readout electronics.
2Object-affected harmful factors
If barrier layers are added to block radiation from reaching electronics, then radiation protection is improved, but device complexity increases
Solution Approach 1:
The barrier layers are designed to perform multiple functions simultaneously: (1) absorbing and blocking X-rays to protect electronics, (2) providing electrical conductivity for signal transmission, and (3) maintaining mechanical support for the layered structure. By integrating these multiple functions into a single component, the design avoids adding separate structures for each function, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The use of composite materials combining radiation-absorbing high-Z materials with electrically conductive materials allows the barrier layer to fulfill multiple roles in a single structure. This approach consolidates what would otherwise require separate components, effectively managing device complexity while achieving both radiation protection and electrical functionality.
3Object-affected harmful factors
If high Z material is used to block radiation, then radiation absorption is improved, but manufacturing complexity increases due to via filling processes
Solution Approach 1:
The patent specifies particular ranges and selections for the high-Z materials (such as tungsten, lead, or bismuth) and their physical properties to optimize both radiation absorption and manufacturability. By carefully selecting materials with appropriate melting points, densities, and chemical properties, the via filling process becomes more controllable and manufacturable while maintaining effective radiation blocking capability.
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 solution effectively reduces radiation exposure to signal electronics, minimizing noise and performance degradation while maintaining electrical connectivity, thus enhancing the reliability of radiographic imaging systems.
Implementation Method 1
a scintillator layer that converts incident radiation into lower energy optical photons
Implementation Method 2
Each barrier layer of the one or more barrier layers includes electrically conductive vias containing a high Z material that blocks radiation from the one or more radiation pathways from reaching the signal electronics
Data Source
AI summary
In one embodiment, a radiation detector is provided. The radiation detector includes a scintillator layer that converts incident radiation into lower energy optical photons. The scintillator layer includes a plurality of pixels formed by one or more dividers, and the one or more dividers form one or more radiation pathways through the scintillator layer. The radiation detector also includes a photodetector layer that detects the lower energy photons generated by the plurality of pixels within the scintillator layer and signal electronics that receive signals generated by the photodetector layer. The radiation detector also includes one or more barrier layers disposed between the photodetector layer and the signal electronics. Each barrier layer of the one or more barrier layers includes electrically conductive vias containing a high Z material that blocks radiation from the one or more radiation pathways from reaching the signal electronics.