Segmented Scintillator Array for Radiation Detector Noise Reduction
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Solution Overview
Problem
Conventional radiation detectors experience a decrease in signal-to-noise (S/N) ratio and timing signal accuracy due to increased noise from amplifiers and the likelihood of pileups in high counting rate environments, where subsequent radiation events occur before the current event is resolved.
Innovation Solution
A radiation detector design featuring a scintillator array segmented by reflection materials, with semiconductor light receiving elements optically connecting multiple scintillators and amplifiers, and a trigger generation circuit that reduces noise by segmenting signal processing into distinct areas, enhancing the S/N ratio and reducing pileup probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of semiconductor light receiving elements is increased to improve detection coverage, then the number of amplifiers increases, but the inherent noise of each amplifier is superimposed, lowering the signal-to-noise ratio
Solution Approach 1:
The patent divides the scintillator array into multiple independent areas using reflection materials as partitions. Each area has its own dedicated amplifier, accumulator, and trigger generation circuit. This segmentation prevents noise from amplifiers in different areas from being superimposed, thereby maintaining a high signal-to-noise ratio while still achieving wide detection coverage through the combined areas.
2Productivity
If the number of amplifiers is increased to handle more scintillators, then detection capability improves, but the inherent noise from each amplifier accumulates, impairing timing signal accuracy
Solution Approach 1:
The patent segments the detection system into multiple independent areas, each with its own complete signal processing chain (amplifier, accumulator, trigger generation circuit). This ensures that timing signals from different areas are generated independently without noise accumulation, maintaining high timing signal accuracy while preserving overall detection capability.
Solution Approach 2:
Each segmented area is designed with dedicated signal processing components optimized for local signal characteristics. The reflection materials create optical boundaries that ensure light from each scintillator is primarily detected by nearby light receiving elements, improving the quality of local signals and reducing cross-area noise interference.
3Device complexity
If signal processing is centralized to simplify the system, then device complexity decreases, but the probability of pileups increases in high counting rate environments
Solution Approach 1:
The patent implements segmented signal processing where each area has its own accumulator and trigger generation circuit that operate independently. This parallel processing architecture reduces pileup probability by handling signals from different areas simultaneously, while the modular design keeps overall system complexity manageable through standardization of each area's components.
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
The solution ensures a high S/N ratio and accurate timing signals by reducing amplifier noise and separately processing signals from different areas, effectively mitigating pileups and improving detection accuracy.
Implementation Method 1
a scintillator array (10) comprising a plurality of scintillators (11)
Implementation Method 2
reflection materials (12) that segment said scintillator array (10) to respective areas (10A, 10B, 10C, 10D)
Data Source
AI summary
A radiation detector includes a plurality of semiconductor light receiving elements and a plurality of reflection elements that segment a scintillator array. A plurality of respective segment areas by the reflection elements. A plurality of amplifiers amplify signals obtained from respective semiconductor light receiving elements. The scintillator array includes a plurality of scintillators. The radiation detector provides a first accumulator per segment area, and a first trigger generation circuit per segment area. The first trigger generation circuit generates a first trigger of the multiple signal added by the first accumulator for each of the plurality of respective segment areas. An encoder generates a single first trigger signal based on the first trigger.