Discrete Bonding Members for Scintillator Substrate Stability
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Solution Overview
Problem
Indirect-type radiation detection apparatuses face issues with adhesive layers peeling off and deforming due to temperature changes and vibrations, leading to artifacts in image signals caused by changes in light propagation from the scintillator to detection substrates.
Innovation Solution
A radiation detection apparatus with a fixed plate supporting detection substrates, a scintillator, and bonding material members that bond the substrates and scintillator without positioning their outer edges between the substrates, allowing for air gaps and reduced thickness to minimize deformation and peeling, thereby maintaining image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a continuous adhesive layer is used to bond detection substrates to the scintillator, then bonding coverage is improved, but the adhesive layer peels off and deforms due to temperature changes and vibrations
Solution Approach 1:
The continuous adhesive layer is divided into multiple discrete bonding material members (first, second, third, and fourth bonding material members) positioned at specific locations. This segmentation prevents the adhesive from peeling and deforming under thermal and mechanical stress, as each discrete member can independently accommodate expansion and contraction without compromising overall bonding integrity.
Solution Approach 2:
Bonding material members are strategically positioned at specific locations where bonding is most critical (corners and edges of the scintillator), rather than using a uniform continuous layer. This localized bonding approach provides sufficient mechanical strength while reducing the total adhesive volume that could deform, thereby improving reliability under temperature changes and vibrations.
2Strength
If the adhesive layer is positioned between detection substrates, then bonding is achieved, but the shape changes influence light propagation and generate image artifacts
Solution Approach 1:
The bonding material members are positioned outside the region between the detection substrates, specifically at the periphery of the scintillator. This extraction of the bonding function from the critical imaging region eliminates the source of light propagation interference, preventing image artifacts while maintaining necessary mechanical bonding strength.
Solution Approach 2:
The bonding material members act as intermediaries that provide mechanical bonding between the scintillator and detection substrates without interfering with the optical path. By positioning them at the periphery, they mediate the mechanical connection while allowing light to propagate freely through the central region between substrates, thus maintaining image quality.
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 suppresses the generation of image artifacts by absorbing substrate height variations and maintaining light transmittance, ensuring high image quality and reduced sensitivity loss.
Implementation Method 1
a scintillator that converts radiation into light that can be sensed by the photoelectric conversion elements
Implementation Method 2
a plurality of bonding material members configured to bond the plurality of detection substrates and the scintillator
Data Source
AI summary
A radiation detection apparatus includes a plurality of detection substrates on which photoelectrical conversion elements are arranged, a plate configured to support the plurality of detection substrates, a scintillator, and a plurality of bonding material members configured to bond the plurality of detection substrates and the scintillator. The plurality of bonding material members bond one-side surfaces of the plurality of detection substrates and a one-side surface of the scintillator, and the plurality of bonding material members are separated from each other and arranged so that outer edges of the plurality of bonding material members are not positioned between the plurality of detection substrates.