Scintillator Layer Coarse Surface for Radiation Detector Adhesion
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Solution Overview
Problem
Existing radiation detectors face challenges in achieving high adhesion between the scintillator layer and the reflective or moisture barrier layers, leading to potential detachment and degradation of characteristics, particularly due to moisture exposure.
Innovation Solution
A radiation detector and scintillator panel design featuring a scintillator layer with a mixed layer portion and a dope material layer portion, where the dope material layer portion is formed with a coarse surface, enhancing the adhesion of the reflective or moisture barrier layers without the need for additional adhesives, and a manufacturing method involving temperature and power control to optimize deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a smooth surface is used on the scintillator layer, then the manufacturing process is simpler, but the adhesion between the scintillator layer and reflective/moisture barrier layers is insufficient
Solution Approach 1:
The patent applies local quality by creating a coarse surface specifically on the dope material layer portion (the outer layer) while keeping the mixed layer portion relatively smooth. This localized surface roughness enhancement provides improved adhesion for the reflective or moisture barrier layers without complicating the entire scintillator structure, resolving the contradiction between adhesion strength and device complexity.
2Strength
If additional adhesive materials are used to improve layer bonding, then adhesion is enhanced, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent employs self-service by enabling the dope material layer to provide its own adhesion-promoting surface structure through the coarse surface formation. This eliminates the need for separate adhesive materials or additional bonding processes, as the roughened surface itself provides the necessary anchoring effect for subsequent layers, thereby maintaining manufacturing simplicity while achieving enhanced adhesion.
3Reliability
If the scintillator layer is exposed to moisture, then manufacturing is easier, but detachment of layers occurs and characteristics degrade
Solution Approach 1:
The patent applies preliminary anti-action by pre-forming a coarse surface structure on the dope material layer before depositing the reflective or moisture barrier layers. This preliminary surface preparation creates a mechanical interlocking effect that prevents layer detachment caused by moisture exposure, countering the harmful effects of moisture before they can cause damage during the device lifecycle.
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
Improves the adhesive power between the scintillator and reflective/moisture barrier layers, preventing detachment and maintaining the scintillator's characteristics, while reducing costs and light scattering, thus enhancing resolution and durability.
Implementation Method 1
The scintillator layer converts radiation incident thereon into fluorescence
Implementation Method 2
The reflective layer reflects fluorescence converted by the scintillator layer
Implementation Method 3
a scintillator layer containing a main material and a dope material and formed on the photo-electric conversion substrate by a vacuum deposition method
Data Source
AI summary
According to one embodiment, a radiation detector includes a photo-electric conversion substrate, a scintillator layer containing a main material and a dope material and a light reflective layer or a moisture barrier layer, formed on a front surface side of the scintillator layer along a shape of the front surface of the scintillator layer. The scintillator layer includes a mixed layer portion formed of the main material the dope material on the photo-electric conversion substrate, and a dope material layer portion formed of only the dope material on a front surface side of the mixed layer portion. A front surface of at least the dope material layer portion is formed into relatively coarse shape compared to the mixed layer portion.