Radiation Detector Moisture-Proof Layer Design
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Solution Overview
Problem
Current moisture-proof structures for X-ray detectors, such as those using polyparaxylylene CVD films or hat-shaped aluminum foils, fail to provide adequate moisture-proof performance under high temperature and high humidity conditions, leading to degradation of scintillator layer resolution and increased detector size due to bonding area requirements.
Innovation Solution
A radiation detector design featuring a surface-smoothing layer made of organic resin and a continuous inorganic moisture-proof layer formed directly on the scintillator layer, using a combination of organic resin and inorganic materials to create a high water vapor barrier with minimal defects and reduced detector size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyparaxylylene CVD film or hat-shaped aluminum foil structure is used for moisture-proofing, then the scintillator layer is protected from humidity, but the moisture-proof performance is insufficient under high temperature and high humidity conditions and the detector size increases due to bonding area requirements
Solution Approach 1:
The patent uses a composite moisture-proof structure consisting of an organic resin layer (such as acrylic resin or polyimide) combined with an inorganic moisture-proof layer (such as aluminum oxide, silicon oxide, or氮化硅). This composite structure leverages the advantages of both organic materials (flexibility, adhesion) and inorganic materials (superior moisture barrier properties, thermal stability) to achieve effective protection against humidity and high temperature conditions, preventing resolution degradation of the scintillator layer.
2Reliability
If a hat-shaped aluminum foil structure is used for moisture-proofing, then moisture-proof performance is improved, but the detector outer dimensions increase due to bonding area requirements
Solution Approach 1:
The patent employs thin film structures for the moisture-proof layers, where the organic resin layer and inorganic moisture-proof layer are deposited as continuous thin films directly on the scintillator layer. This approach eliminates the need for bulky hat-shaped aluminum foil structures with large bonding areas, achieving effective moisture protection while maintaining compact detector dimensions.
3Reliability
If a reflection film is formed on the scintillator layer to increase fluorescence utilization efficiency, then sensitivity characteristics are improved, but the moisture-proof structure becomes more complex
Solution Approach 1:
The patent designs the moisture-proof structure to serve multiple functions: the organic resin layer provides both adhesion and moisture barrier properties, while the inorganic moisture-proof layer provides superior moisture protection and can also function as a reflection film to increase fluorescence utilization efficiency. This multi-functional design achieves sensitivity improvement without increasing moisture-proof structure complexity.
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 effectively maintains high temperature and high humidity resistance while preventing resolution degradation and minimizing the detector's outer dimensions, ensuring reliable moisture-proof performance and improved sensitivity characteristics.
Implementation Method 1
the X-ray is converted to visible light, namely, fluorescence by a scintillator layer
Implementation Method 2
the fluorescence is converted to a signal charge by a photoelectric conversion element such as an amorphous silicon (a-Si) photodiode
Implementation Method 3
a moisture-proof layer which is a continuous film formed on a surface of the surface-smoothing layer by direct film formation and consisting from inorganic material
Data Source
AI summary
According to the embodiment, a radiation detector includes an array substrate including a photoelectric conversion element, a scintillator layer formed on the photoelectric conversion element and converting radiation to fluorescence, and a moisture-proof layer including a surface-smoothing layer which is a continuous film formed to cover the scintillator layer and including at least an organic resin material as a main component and a moisture-proof layer which is a continuous film formed on a surface of the smoothed layer by direct film formation and consisting from inorganic material.