X-ray Tube Beryllium Window Corrosion Protection
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Solution Overview
Problem
Beryllium windows in X-ray tubes corrode due to exposure to atmospheric gases, leading to vacuum state destruction, as conventional protective films allow acidic gases to penetrate and cause corrosion.
Innovation Solution
A stationary anode X-ray tube design featuring a beryllium window with an X-ray-resistive resin film, such as polyetheretherketone (PEEK) or polyimide, separated by a gap and adhered to a window frame, creating a dry gas-filled space that prevents corrosive acid formation and penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a beryllium window is used as the X-ray transmission window, then X-ray transmission accuracy is improved, but the window and brazed portion are corroded by atmospheric gases
Solution Approach 1:
A protective film is introduced as an intermediary layer between the beryllium window and the atmospheric environment. This film acts as a barrier that prevents corrosive gases from reaching the beryllium window and brazed portions, thereby maintaining vacuum state stability while preserving X-ray transmission accuracy through the thin beryllium window.
Solution Approach 2:
The protective film creates an inert barrier environment that isolates the beryllium window from reactive atmospheric gases. By preventing direct contact between atmospheric components and the beryllium surface, the film eliminates corrosion mechanisms while maintaining the structural integrity and transmission properties of the window.
2Reliability
If a protective film is applied on the beryllium window, then corrosion resistance is improved, but the film deteriorates under X-ray irradiation
Solution Approach 1:
The invention changes the material parameters of the protective film by selecting specific polymers with high radiation resistance. The film is designed with controlled thickness and composition parameters that balance corrosion protection capabilities with resistance to X-ray induced deterioration, extending the operational lifespan of the protective layer.
3Measurement precision
If the beryllium window is made thinner, then X-ray transmission accuracy is improved, but corrosion susceptibility increases
Solution Approach 1:
The protective film serves as a mediator that decouples the relationship between window thickness and corrosion susceptibility. By providing an external barrier layer, the system allows the use of thinner beryllium windows for improved X-ray transmission without increasing corrosion risk, as the protective film assumes the corrosion resistance function.
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
This design effectively prevents corrosion of the beryllium window and maintains the vacuum state by isolating it from corrosive gases, prolonging the X-ray tube's life cycle and ensuring high reliability.
Implementation Method 1
a dry gas is filled in the space
Implementation Method 2
an X-ray transmission window formed of a beryllium thin plate, accommodated in the window frame, and configured to maintain, along with the window frame, a vacuum-tight state inside the envelope and transmit X-rays
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
According to one embodiment, an X-ray tube includes an envelope with an opening, an X-ray transmission assembly (20) mounted on the envelope and vacuum-tightly blocking the opening, a cathode and an anode target. The X-ray transmission assembly (20) includes a window frame (21), an X-ray transmission window (22), an X-ray-resistive resin film (23), a sealing member (25) and a dry gas (29). The X-ray transmission window (22) is formed of a beryllium thin plate, accommodated in the window frame (21), and configured to maintain, along with the window frame (21), a vacuum-tight state inside the envelope. The X-ray-resistive resin film (23) forms a space inside along with the window frame (21) and the X-ray transmission window (22). The dry gas (29) fills the space.