Radiation Detector Moistureproof Sealing with Adhesion Layer
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Solution Overview
Problem
Conventional moistureproof structures for radiation detectors, such as those using poly-paraxylene CVD films or adhesive agents, fail to provide adequate moistureproof performance and reliability against temperature changes and thermal shocks, leading to degradation in luminance and resolution under high-temperature and high-humidity conditions.
Innovation Solution
A radiation detector design featuring a hat-shaped moistureproof body with a flange portion that adheres to the substrate using a thin adhesion layer, combined with an inorganic filler material in the adhesion layer to reduce moisture transmission, and a laminated structure of inorganic films to enhance moistureproof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a poly-paraxylene CVD film is used as a moistureproof layer, then the scintillator layer is covered and protected, but the moisture transmission barrier characteristic is inadequate leading to degradation in luminance and resolution
Solution Approach 1:
The patent employs a composite moistureproof structure consisting of a moistureproof body (metal or resin with moisture-proof paint) combined with a moistureproof adhesive layer having low moisture transmission characteristics. This composite approach achieves adequate moisture blocking performance without degrading the luminance and resolution of the scintillator layer, resolving the contradiction between moistureproof reliability and manufacturing precision.
2Reliability
If a cover adheres onto an enclosure member with adhesive agent to seal the scintillator layer, then the scintillator layer is sealed, but the structure shows poor reliability against temperature changes and thermal shocks
Solution Approach 1:
The patent changes the material parameters of the moistureproof structure by using a moistureproof body made of metal or resin with moisture-proof paint, combined with a specifically formulated moistureproof adhesive layer. This material parameter optimization maintains sealing performance while ensuring stability under temperature changes and thermal shocks, resolving the contradiction between sealing reliability and compositional stability.
3Reliability
If a thick moistureproof body is used to block moisture transmission, then moistureproof performance improves, but radiation absorption loss increases
Solution Approach 1:
The patent segments the moistureproof function into two distinct components: a moistureproof body (metal or resin with moisture-proof paint) and a separate moistureproof adhesive layer. This segmentation allows the moistureproof body to be kept thin for minimal radiation absorption, while the adhesive layer provides the necessary moisture transmission barrier characteristic, thus resolving the contradiction between moisture transmission blocking and radiation absorption loss.
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 design significantly improves moistureproof reliability and maintains resolution and luminance over extended high-temperature and high-humidity tests, minimizing moisture transmission and radiation absorption loss while ensuring high detection ability.
Implementation Method 1
a flange portion (33) formed while being projected from a periphery of the moistureproof body (15), wherein the flange portion (33) of the moistureproof body (15) and the substrate (12) adhere to each other with the adhesion layer (34) interposed therebetween
Implementation Method 2
an inorganic filler material in the adhesion layer to reduce moisture transmission
Implementation Method 3
a scintillator layer (13) which converts incident radiation into light
Implementation Method 4
a photoelectric conversion element such as an amorphous silicon (a-Si) photodiode and a CCD (Charge Coupled Device), thereby obtaining an image
Implementation Method 5
a method for forming a reflection layer on the scintillator layer in order to enhance use efficiency of the fluorescence from the scintillator layer
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
According to an embodiment of the invention, a radiation detector (11) includes, a substrate (12) comprising a photoelectric conversion element (21), a scintillator layer (13) formed on the substrate (12)and converts radiation into fluorescence, a moistureproof body (15) comprising a flange portion (33) in a periphery thereof while having a depth containing at least the scintillator layer (13), and an adhesion layer (34) that causes the substrate (12) and the flange portion (33) of the moistureproof body (15) to adhere to each other in a sealed manner.