Tungsten Electrode in X-Ray Tubes
Tungsten electrodes are critical electron-emitting materials used in X-ray tubes for industrial non-destructive testing, security inspection, medical imaging, and scientific analytical equipment. In high-vacuum environments, tungsten electrodes serve as cathode electron sources that continuously emit electrons. These electrons are accelerated by high-voltage electric fields and strike anode targets to generate X-rays. Therefore, electron emission capability, thermal stability, and service life directly affect image quality and operational reliability. Modern industrial X-ray tubes primarily use barium tungsten (Ba-W) cathode to achieve higher electron emission efficiency and longer operating life.
1. Working Principle of Tungsten Electrodes in X-Ray Tubes
In high-vacuum environments, barium tungsten cathodes are heated to approximately 1000–1150°C to generate thermionic electron emission. Active barium layers reduce cathode work function to approximately 1.6–2.0 eV, significantly improving electron emission efficiency. Emitted electrons are accelerated by high-voltage electric fields ranging from 40 to 300 kV and bombard anode targets, converting part of their kinetic energy into X-rays for inspection and imaging applications. For pulsed X-ray tubes, control grids regulate electron beam emission, enabling pulsed operation and high-dose-rate imaging.
2. Features of CTIA’s Tungsten Electrodes in X-Ray Tubes
CTIA’s tungsten electrodes (barium tungsten electrodes) offer the following advantages:
(1) Low work function and high electron emission efficiency
(2) Low operating temperature and reduced heating power requirements
(3) Stable emission current for continuous and pulsed operation
(4) Porous tungsten matrices continuously replenish active barium for extended service life
(5) Excellent resistance to high-voltage operating environments
(6) Suitable for high-speed imaging and dynamic inspection applications
3. Applications of CTIA’s Tungsten Electrodes
CTIA’s tungsten electrodes are used in: (1) industrial non-destructive testing systems; (2) security inspection equipment; (3) medical X-ray imaging equipment; (4) pulsed X-ray inspection systems; (5) scientific analytical instruments; (6) high-energy electron beam and vacuum electronic devices.
4. Specifications of CTIA’s Tungsten Electrodes in X-Ray Tubes
CTIA’s tungsten electrode (barium tungsten electrode) specifications for X-ray tubes are shown in picture below:
CTIA GROUP (CTIA) has over 30 years of experience in tungsten electrode manufacturing, supported by integrated capabilities in tungsten powder processing, powder metallurgy, vacuum sintering, and precision machining. CTIA’s barium tungsten electrodes for X-ray tubes are available in customized dimensions, pore structures, and mounting configurations, delivering reliable electron emission performance for industrial inspection, security screening, and medical imaging systems.
For any inquiry, please contact tungsten electrode manufacturer: CTIA GROUP
Email: sales@chinatungsten.com
Tel: 0086 592 5129696 / 0086 592 5129595
Website: www.tungsten.com.cn
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