Radiation Detector Subpixel Design for Spatial Resolution
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Solution Overview
Problem
Current radiation detectors face challenges in accurately measuring radiation flux and spectrum, particularly in achieving high spatial resolution while maintaining efficient radiation absorption, which is crucial for applications like medical imaging and cargo scanning.
Innovation Solution
A detector comprising multiple subpixels that generate electrical signals upon radiation exposure, allowing for the determination of radiation particle counts and intensity, with a semiconductor radiation absorption layer that directly converts radiation into electric signals, eliminating the need for scintillators and enabling energy spectrum analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If scintillators are used to convert radiation to visible light, then radiation absorption is improved, but spatial resolution deteriorates due to light spreading and scattering
Solution Approach 1:
The patent removes the scintillator component from the detection system entirely. Instead of converting radiation to light and then detecting it, the system directly detects radiation-induced electrical signals in the semiconductor layer, eliminating the light spreading and scattering problem that degrades spatial resolution.
Solution Approach 2:
The patent replaces the optical detection mechanism (scintillator + photodetector) with a direct electrical detection mechanism. Radiation is converted directly into electrical signals within the semiconductor layer, bypassing the optical conversion step that causes light diffusion and resolution loss.
2Manufacturing precision
If scintillator thickness is reduced to improve spatial resolution, then spatial resolution is improved, but radiation absorption efficiency deteriorates
Solution Approach 1:
The patent eliminates the need for a thick scintillator by removing the scintillator entirely. Direct conversion in the semiconductor layer allows for sufficient radiation absorption without the light diffusion problems that would occur even in thinner scintillators.
Solution Approach 2:
The patent changes the detection mechanism from optical to electrical, fundamentally altering how radiation is converted and detected. This parameter change allows for direct measurement of radiation effects without the intermediate optical conversion step that limits scintillator design options.
3Adaptability or versatility
If multiple measurement modes (particle count and intensity) are implemented in separate subpixels, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple measurement functions within a single integrated pixel structure. Each pixel contains multiple subpixels that can operate in different measurement modes (particle count, intensity, energy spectrum), allowing versatile measurements without requiring separate detector systems for each function.
Solution Approach 2:
The patent creates a universal pixel design that can perform multiple measurement functions. The same basic pixel structure with its subpixels can be configured for particle counting, intensity measurement, or energy spectrum analysis, making the detector adaptable to different measurement needs without redesigning the fundamental architecture.
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 provides enhanced accuracy in radiation imaging and spectroscopy by effectively measuring radiation particle counts and intensity, improving spatial resolution and energy spectrum analysis without the limitations of scintillators, suitable for medical imaging, cargo scanning, and other applications.
Implementation Method 1
When a particle of radiation is absorbed in the semiconductor layer, multiple charge carriers (e.g., electrons and holes) are generated and swept under an electric field towards electric contacts on the semiconductor layer
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Disclosed herein is a detector (100), comprising: a pixel (150) comprising a first subpixel (151A) and a second subpixel (151B), wherein the first subpixel (151A) is configured to generate a first electrical signal upon exposure to radiation, and wherein the second subpixel (151B) is configured to generate a second electrical signal upon exposure to the radiation; wherein the detector is configured to determine a number of particles of the radiation incident on the first subpixel (151A) over a first period of time, based on the first electrical signal; wherein the detector is configured to determine an intensity of the radiation by integrating the second electrical signal over a second period of time.