Flexible Radiation Detector Bending Suppression Member
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Solution Overview
Problem
Flexible radiation detector substrates are prone to localized bending due to the weight of the scintillator, which can cause damage to the scintillator, especially when it includes columnar crystals that may contact each other during significant bending.
Innovation Solution
A radiation detector design that incorporates a bending suppression member with a higher rigidity than the substrate, extending to cover the scintillator and connection regions, to prevent substrate bending and reduce the risk of scintillator damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used for the radiation detector, then the detector can be made lightweight and adaptable, but the substrate is prone to localized bending due to the weight of the scintillator
Solution Approach 1:
The support structure is segmented into multiple rigid support members distributed across the substrate, each providing localized support to prevent bending in specific regions while maintaining overall substrate flexibility
Solution Approach 2:
The substrate system uses a composite structure combining flexible substrate material with rigid support members, creating a hybrid system that exhibits both flexibility and bending resistance properties
2Reliability
If the scintillator includes plural columnar crystals, then the light detection efficiency is improved, but the scintillator may sustain damage due to mutually adjacent columnar crystals contacting each other during substrate bending
Solution Approach 1:
Rigid support members are positioned beneath the scintillator to preemptively counteract bending forces before they can cause columnar crystal contact and damage, maintaining crystal spacing and structural integrity
Solution Approach 2:
The support members are pre-installed and positioned to provide immediate structural support to the scintillator, preventing bending-induced damage before it occurs during device operation or handling
3Reliability
If a bending suppression member is added to prevent substrate bending, then the scintillator is protected from damage, but the device complexity increases
Solution Approach 1:
Bending suppression is implemented locally at specific critical regions beneath the scintillator and connection areas, rather than making the entire substrate rigid, thus providing necessary protection while minimizing overall structural complexity
Solution Approach 2:
Support members are strategically placed only in regions where bending suppression is most critical (under the scintillator and connection regions), providing sufficient protection without adding support in all areas
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 implementation of the bending suppression member effectively reduces the risk of scintillator damage from substrate bending, enhances the bending suppression effect, and supports the substrate's ability to handle the weight of the scintillator without deformation.
Implementation Method 1
a bending suppression member configured to suppress bending of the substrate, wherein the bending suppression member has a rigidity satisfying R ≥ L - r/tanΦ + 4r × {(L - r/tanΦ) 2 + d 2}/2d
Implementation Method 2
a scintillator stacked on the substrate and including a plurality of columnar crystals
Data Source
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AI summary
A radiation detector includes a flexible substrate, plural pixels provided on the substrate and each including a photoelectric conversion element, a scintillator stacked on the substrate and including plural columnar crystals, and a bending suppression member configured to suppress bending of the substrate. The bending suppression member has a rigidity that satisfies R ≥ L - r/tanΦ + 4r · {(L - r/tanΦ)2 - (d/2)2}1/2/d, wherein L is an average height of the columnar crystals, r is an average radius of the columnar crystals, d is an average interval between the columnar crystals, Φ is an average tip angle of the columnar crystals, and R is a radius of curvature of bending occurring in the substrate due to the weight of the scintillator.