High Z Shielding Layer for Radiation Detector Electronics
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Solution Overview
Problem
Conventional radiographic detectors face challenges in positioning electronics and circuitry within the radiation path due to unconverted X-rays, which can degrade components and introduce noise and design complexity.
Innovation Solution
A radiation detector design featuring a scintillator layer converting X-rays to optical photons, a photodetector layer with high Z material shielding signal electronics, and placing these electronics directly behind the photodiodes to minimize the analog pathway and protect them from radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal electronics are positioned within the radiation path to minimize analog pathway length, then noise is reduced and imaging precision is improved, but the unconverted X-rays degrade the electronics and circuitry
Solution Approach 1:
A high Z material layer is introduced as an intermediary between the scintillator/photodetector assembly and the signal electronics. This layer acts as a radiation shield that absorbs unconverted X-rays before they reach the electronics, protecting them from degradation while allowing the electronics to remain positioned close to the photodetectors for minimal analog pathway length and optimal imaging precision.
2Reliability
If signal electronics are positioned far from photodetectors to shield them from radiation, then electronics are protected from degradation, but the analog pathway length increases and noise increases
Solution Approach 1:
The high Z material layer serves as a protective intermediary that enables close positioning of electronics to photodetectors without direct radiation exposure. This resolves the contradiction by allowing the electronics to remain in the optimal position for minimal analog pathway length while still being protected from harmful radiation through the shielding layer.
Solution Approach 2:
Instead of positioning electronics farther away in the radiation path (one-dimensional solution), the high Z material layer provides protection in a different spatial dimension - creating a localized shielded zone that allows close proximity positioning while blocking radiation. This dimensional approach maintains short analog pathways while ensuring electronics protection.
3Reliability
If a high Z material layer is added to shield signal electronics from radiation, then electronics are protected from degradation, but device complexity increases
Solution Approach 1:
The high Z material layer serves multiple functions simultaneously: it shields signal electronics from radiation degradation, maintains structural integrity of the detector assembly, and can be integrated with existing detector layers. This multi-functionality justifies the added structural element by providing comprehensive protection without requiring separate shielding 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
This configuration allows for effective detection of X-rays while reducing noise and design complexity by shielding signal electronics from unabsorbed radiation, enabling more precise imaging systems like CT and fluoroscopic systems.
Implementation Method 1
a scintillator layer configured to convert incident radiation into lower energy optical photons
Implementation Method 2
a photodetector layer configured to detect the lower energy photons generated by the scintillator
Implementation Method 3
the photodetector layer comprises a layer of high Z material... substantially shielded from radiation by the layer of high Z material
Data Source
AI summary
The present disclosure relates to radiation detectors having a layer of a high Z material, such as tungsten or lead, disposed on a face of a photodetector layer or other underlying layer. In one embodiment, the layer of the high Z material substantially prevents radiation from reaching on or more electronics components or circuits, such as an analog-to-digital conversion ASIC or other circuit.