Flexible Radiation Detector with Columnar Scintillator and Moisture-Proof Layer
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Solution Overview
Problem
Radiation detectors with flexible polymer film substrates face issues with scintillator layer detachment and crystal breakage due to insufficient flexibility and deformation stress, especially when multiple light receiving elements are tiled, leading to reduced reliability and resolution.
Innovation Solution
A radiation detector design featuring a flexible base with a scintillator layer of columnar structures, a moisture-proof protective layer, and multiple light receiving elements, allowing for deformation to match the light receiving surface and enhancing bending deformation strength, thus preventing scintillator layer breakage and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a polymer film is used as the supporting substrate to enable deformation and conform to the light receiving surface, then the resolution is improved, but the scintillator layer is easily detached and crystals are broken due to insufficient flexibility
Solution Approach 1:
The patent uses a flexible polymer film as the supporting substrate that can deform to conform to the light receiving surface, improving resolution while maintaining flexibility. The film's ability to bend allows it to adapt to surface irregularities without causing scintillator layer detachment or crystal breakage.
Solution Approach 2:
The patent creates a composite structure combining the flexible polymer film substrate with the scintillator layer, where the polymer film provides both the necessary flexibility for deformation and sufficient mechanical strength to support the scintillator layer, preventing detachment and crystal breakage while enabling resolution improvement.
2Area of stationary object
If multiple light receiving elements are arranged in a tiled form to increase the screen size, then the screen size is increased, but large deformation along the step is applied to the scintillator layer causing crystal breakage
Solution Approach 1:
The flexible polymer film substrate allows the scintillator layer to deform and follow the steps between adjacent light receiving elements, distributing the deformation stress uniformly and preventing concentrated stress that would cause crystal breakage, thereby enabling large screen sizes with multiple tiled elements.
Solution Approach 2:
The patent introduces dynamic flexibility to the supporting substrate, allowing it to adapt its shape to accommodate the stepped structure of multiple light receiving elements. This dynamic deformation capability enables the system to maintain structural integrity across large areas with multiple tiled elements.
3Use of energy by moving object
If the scintillator layer is made from columnar crystals to improve light generation, then the light generation is improved, but the layer is prone to breakage when deformed
Solution Approach 1:
The flexible polymer film substrate provides a compliant foundation that allows the columnar crystal scintillator layer to deform without breaking. The film's flexibility distributes mechanical stress, protecting the brittle columnar crystals from breakage while maintaining their light-generating properties.
Solution Approach 2:
The patent creates a composite system where the flexible polymer film substrate combines with the columnar crystal scintillator layer to form a structure that exhibits both the light-generating properties of the crystals and the flexibility of the polymer, achieving improved bending deformation strength.
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 achieves improved reliability and resolution by allowing the flexible base and scintillator layer to conform to surface steps, reducing strain and crystal breakage, while enabling a large screen size at a lower cost with enhanced durability and reduced wrinkle occurrence.
Implementation Method 1
a scintillator layer made from a plurality of columnar structures formed on the emission surface through crystal growth and generating light due to the incident radiation
Implementation Method 2
since a flexible base having flexible properties is used as a member that supports the scintillator layer, even when a step is formed between the adjacent light receiving elements, it is possible to deform the flexible base and the scintillator layer so as to follow the step
Data Source
AI summary
Provided is a radiation detector 1 capable of improving reliability while using a plurality of light receiving elements to provide a large screen size. A radiation detector 1 includes: a flexible supporting substrate 5 that includes a radiation incident surface 5a and a radiation emission surface 5b; a scintillator layer 6 made from a plurality of columnar crystals H formed on the emission surface 5b through crystal growth and generating light due to the incident radiation; a moisture-proof protective layer 7 covering the scintillator layer 6 and filled between the plurality of columnar crystals H; and light receiving elements 8A to 8D arranged to oppose the scintillator layer 6 and detecting the light generated in the scintillator layer 6.