Graphene Pinhole-Blocking Layer for X-Ray Radiation Windows
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Solution Overview
Problem
Existing radiation window materials for X-ray applications often suffer from pinholes, leading to gas leakage and contamination in gas-filled enclosures, and mechanical stress issues due to pressure differences.
Innovation Solution
A radiation window membrane is created using a graphene pinhole-blocking layer attached to a window base layer, where the graphene layer is produced using thin film manufacturing techniques like CVD or ALD to prevent pinholes and enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin film manufacturing techniques (sputtering or chemical vapor deposition) are used to create additional layers on a beryllium base membrane, then X-ray transmission is improved, but pinholes may appear causing gas leakage
Solution Approach 1:
The patent uses a graphene layer (a single-atom-thick film) as a pinhole-blocking layer on the beryllium membrane. This ultra-thin film structure effectively seals pinholes while maintaining X-ray transmission, as graphene's two-dimensional continuous structure blocks gas leakage pathways without significantly attenuating X-rays.
Solution Approach 2:
The patent creates a composite structure by combining beryllium base membrane with a graphene pinhole-blocking layer. This composite material leverages the advantages of both materials: beryllium provides good X-ray transmission and mechanical strength, while graphene provides pinhole sealing capability, together achieving both gas tightness and manufacturing feasibility.
2Reliability
If the window membrane is made thinner to reduce X-ray attenuation, then X-ray transmission is improved, but mechanical strength to withstand pressure difference deteriorates
Solution Approach 1:
The patent employs an ultra-thin graphene layer as a reinforcement coating on the beryllium membrane. This atomically thin film significantly enhances the mechanical strength and pressure resistance of the membrane without appreciably increasing thickness, thereby maintaining excellent X-ray transmission while preventing membrane failure under pressure differential.
Solution Approach 2:
The composite structure of beryllium base membrane plus graphene coating creates a material system where the graphene layer acts as a strength-enhancing reinforcement. This composite achieves superior mechanical properties compared to pure beryllium, enabling thinner designs that maintain both X-ray transmission and pressure withstand capability.
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 pinhole-blocking layer effectively prevents gas leakage and enhances the mechanical strength of the radiation window membrane, ensuring reliable X-ray transmission with minimal attenuation and improved durability.
Implementation Method 1
a pinhole-blocking layer on a surface of the window base layer, which pinhole-blocking layer comprises graphene
Implementation Method 2
through which opening X-rays are to pass
Data Source
AI summary
A radiation window membrane and for covering an opening in an X-ray device is presented, as well a method for its manufacturing. Said openings are such through which X-rays are to pass. The membrane comprises a window base layer and a pinhole-blocking layer on a surface of said window base layer. Said pinhole-blocking layer comprises graphene.