Graphene Window for X-ray Detectors
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Solution Overview
Problem
Conventional X-ray radiation passage windows for detectors face challenges in achieving high transmission for both low- and high-energy X-rays, while also requiring high hermeticity, thermal stability, and non-transmissivity to visible light, and are often made from materials like beryllium that are carcinogenic.
Innovation Solution
The use of a graphene-containing radiation-transmissive window element with a graphene layer, which can be multilayered, providing excellent X-ray transmission, hermeticity, and thermal stability, and is non-toxic, along with additional layers for light blocking and electrical conductivity, and a structured substrate for mechanical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If beryllium windows are used for high-energy X-ray transmission, then transmission of high-energy X-rays is improved, but toxicity and carcinogenicity worsen
Solution Approach 1:
The patent uses a composite structure combining graphene layers with a polymer matrix (such as polyimide). This composite material achieves high X-ray transmission like beryllium while eliminating its toxicity. The graphene provides radiation-transmissive properties, and the polymer provides mechanical stability and hermeticity, creating a non-toxic alternative to beryllium windows.
2Use of energy by moving object
If thin window elements are used for high X-ray transmission, then X-ray transmission is improved, but hermeticity and mechanical stability worsen
Solution Approach 1:
The composite structure uses a thin graphene-polymer layer for X-ray transmission while the polymer matrix provides hermetic sealing. The graphene layers are integrated into the polymer structure, creating a composite that maintains hermeticity even at thin dimensions, unlike pure thin-film solutions.
Solution Approach 2:
The patent employs thin-film technology with graphene layers integrated into a flexible polymer matrix. This allows the window to be made thin for high transmission while the polymer provides the necessary mechanical strength and hermetic sealing, preventing gas or liquid penetration.
3Ease of manufacture
If conventional materials are used for window elements, then manufacturing simplicity is maintained, but thermal stability above 150°C deteriorates
Solution Approach 1:
The graphene-polymer composite maintains ease of manufacture through established polymer processing techniques while adding graphene layers. The polymer matrix can be processed using conventional methods, and graphene can be integrated during manufacturing, achieving thermal stability above 150°C without significantly complicating the manufacturing process.
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 graphene-containing window element offers superior X-ray transmission, high impermeability, and chemical resistance, while being non-toxic and light-blocking, with enhanced mechanical stability and electrostatic dissipation, improving the performance and safety of radiation detectors.
Implementation Method 1
The radiation-transmissive window element contains graphene... very good transmission for both low- and high-energy X-ray radiation... light-non-transmissive to visible light over the entire wavelength range
Implementation Method 2
such an an X-ray radiation passage window has a high hermetic impermeability (e.g., 1 bar)
Implementation Method 3
an electrical conductivity required for an electrostatic dissipation
Data Source
AI summary
An X-ray radiation passage window can be used for a radiation detector. The X-ray radiation passage window for a radiation detector includes a radiation-transmissive window element. The radiation-transmissive window element contains graphene. Furthermore, a radiation detector including an X-ray radiation passage window, a method for producing an X-ray radiation passage window and a use of graphene are disclosed.