Structured Manufacturing Data (2026)

Medical X-Ray Tube Cathode Assembly

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Medical X-Ray Tube Cathode Assembly used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Medical X-Ray Tube Cathode Assembly is characterized by the integration of Tungsten Filament and Molybdenum Focusing Cup. In industrial production environments, manufacturers listed on CNFX commonly emphasize Tungsten filament construction to support stable, high-cycle operation across diverse manufacturing scenarios.

Electron emission source for medical X-ray generation

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Product Specifications

Technical details and manufacturing context for Medical X-Ray Tube Cathode Assembly

Definition
A critical sub-assembly within medical X-ray tubes that generates the electron beam required for X-ray production. This component consists of a heated filament and focusing cup that emits and directs electrons toward the anode target. It directly determines the quality, intensity, and stability of the X-ray output in diagnostic imaging equipment. Proper cathode design is essential for achieving consistent radiographic results and minimizing patient radiation exposure.
Working Principle
Electrical current heats the tungsten filament to thermionic emission temperatures, releasing electrons that are focused and accelerated toward the anode by the focusing cup's electrostatic field.
Common Materials
Tungsten filament, Molybdenum focusing cup, Ceramic insulators, Nickel support wires
Technical Parameters
  • Maximum operating voltage rating (kV) Standard Spec
  • Maximum filament current capacity (mA) Standard Spec
Components / BOM

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Medical X-Ray Tube Cathode Assembly.

X-ray tube electron emitter X-ray filament assembly Medical cathode assembly medical X-ray tube cathode assembly replacement tungsten filament cathode for X-ray tubes molybdenum focusing cup medical imaging electron emission source X-ray generation X-ray tube cathode assembly specifications

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
current: 0.1-1000 mA typical
voltage: 40-150 kV typical
pressure: High vacuum required (typically <10^-5 Torr)
temperature: Ambient to 150°C (operating), -40°C to 200°C (storage)
filament heating: 2-12 V, 2-10 A typical
Media Compatibility
✓ High vacuum environments ✓ Medical X-ray generator housings ✓ Clean room assembly conditions
Unsuitable: Atmospheric pressure or non-vacuum environments
Sizing Data Required
  • Required X-ray tube voltage (kV)
  • Required tube current (mA)
  • Target focal spot size (mm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cathode filament degradation
Cause: Thermal fatigue from repeated heating/cooling cycles leading to embrittlement and eventual breakage, often accelerated by tungsten evaporation at high temperatures or improper filament current settings.
Insulation breakdown in cathode assembly
Cause: Carbon tracking or dielectric failure due to high-voltage arcing, contamination from outgassing of materials, or moisture ingress compromising electrical isolation between cathode components and ground.
Maintenance Indicators
  • Audible arcing or popping sounds during tube operation indicating electrical discharge
  • Visible darkening or metallic deposits on tube envelope near cathode, suggesting filament evaporation or sputtering
Engineering Tips
  • Implement strict warm-up/cool-down protocols and avoid rapid cycling to minimize thermal stress on tungsten filaments
  • Maintain optimal vacuum integrity through regular high-voltage conditioning and monitoring of tube current stability to prevent insulation degradation

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems IEC 60601-2-28:2017 - Medical electrical equipment - Part 2-28: Particular requirements for the basic safety and essential performance of X-ray tube assemblies for medical diagnosis ASTM F640-12(2017) - Standard Test Methods for Determining Radiopacity for Medical Use
Manufacturing Precision
  • Cathode filament alignment: +/-0.05mm relative to anode target
  • Focusing cup concentricity: 0.1mm total indicator runout
Quality Inspection
  • High-voltage leakage test at 125% rated voltage
  • X-ray output consistency test using calibrated dosimeter

Factories Producing Medical X-Ray Tube Cathode Assembly

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the typical lifespan of this medical X-ray tube cathode assembly?

Our cathode assemblies typically offer 10,000+ hours of operational lifetime when used within specified emission current and temperature parameters, ensuring reliable performance for medical imaging systems.

How does the molybdenum focusing cup improve X-ray tube performance?

The molybdenum focusing cup precisely directs electron flow toward the anode, increasing X-ray generation efficiency and producing sharper diagnostic images while maintaining thermal stability at high operating temperatures.

What are the key specifications for proper cathode assembly installation?

Critical specifications include: Emission Current (mA range), Filament Current (A), Filament Voltage (V), Focusing Cup Voltage (V), and Operating Temperature (°C). Always consult manufacturer guidelines for specific equipment compatibility.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Computer, Electronic and Optical Product Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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