Medical X-Ray Tube Anode Assembly

Product Specifications

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

Definition

The Medical X-Ray Tube Anode Assembly is a critical rotating component within medical X-ray tubes, serving as the target for electron bombardment to generate X-rays. This assembly consists of a high-speed rotating anode disk mounted on a molybdenum stem with a copper rotor, designed to distribute heat across a larger surface area to prevent localized overheating. It enables higher power output and longer tube life by efficiently managing thermal loads during radiographic imaging procedures. The assembly's precise rotation and thermal characteristics directly impact image quality and equipment reliability in diagnostic and therapeutic applications.

Key specifications include an anode disk diameter of 70–120 mm, a maximum rotational speed of 3000–10000 rpm, and a thermal capacity of 300–600 kJ. The focal spot size ranges from 0.6–1.2 mm, and the anode angle is 12–17 degrees. The bearing type is ball, and the operating temperature range is -40 to 85 °C. The maximum operating pressure is 0.1–0.5 MPa, with a material grade of TZM (per ASTM B386) for the stem. The assembly weighs 1.5–3.0 kg, has a surface roughness of 0.8–1.6 μm Ra, and a radiation resistance of 1–10 MGy.

Materials used include tungsten-rhenium alloy for the target surface, molybdenum for the stem, copper for the rotor, and graphite for heat storage. These components work together to manage thermal and mechanical stresses during operation.

This directory entry provides reference ranges for typical configurations. Actual values must be verified with the legal manufacturer or supplier for specific models and applications. Standards listed are for procurement reference only and do not imply certification or compliance.

Working Principle

Electrons from the cathode strike the rotating tungsten-rhenium alloy target surface on the anode disk, generating X-rays through bremsstrahlung radiation. The rotation spreads heat across the larger surface area, preventing localized melting. The molybdenum stem and copper rotor facilitate heat transfer and rotation, while graphite may be used for additional heat storage. The anode angle and focal spot size are optimized for imaging performance.

Common Materials

Tungsten-Rhenium Alloy, Molybdenum, Copper, Graphite

Technical Parameters

Parameter	Typical range	Notes & selection driver
Anode Disk DiameterRequired	70–120 mm	Diameter of the tungsten-rhenium target surface
Maximum Rotational SpeedRequired	3000–10000 rpm	Maximum sustainable rotation speed under load
Thermal CapacityRequired	300–600 kJ	Maximum heat storage capacity before cooling required
Focal Spot SizeRequired	0.6–1.2 mm	Effective area where electrons strike the target
Anode AngleRequired	12–17 degrees	Angle of the target surface relative to electron beam
Bearing Type	Ball text	Type of bearing system (ball, magnetic, etc.)
Operating Temperature	-40–85 °C	Survival range; performance may degrade outside.
Maximum Operating Pressure	0.1–0.5 MPa	For vacuum envelope integrity.
Material Grade	TZM	TZM alloy for high temperature strength.ASTM B386
Weight	1.5–3.0 kg	Affects gantry balance and motor load.
Surface Roughness	0.8–1.6 μm Ra	Critical for electron beam focus and heat transfer.
Radiation Resistance	1–10 MGy	Total dose before material degradation.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Tungsten-Rhenium Target Disk
Primary X-ray generation surface through electron bombardment

Material: Tungsten-Rhenium alloy (90-95% W, 5-10% Re)
Molybdenum Stem Part
Structural support and thermal conduction between disk and rotor

Material: Pure molybdenum or molybdenum alloy
Copper Rotor Part
Induction motor component for high-speed rotation

Material: High-purity oxygen-free copper
Graphite Backing Optional Part
Thermal storage and heat distribution layer

Material: High-density graphite
Bearing Assembly
Low-friction rotation mechanism with lubrication system

Material: Stainless steel with ceramic balls

Industry Taxonomies & Aliases

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

Manufacturers of Medical X-Ray Tube Anode Assembly

Manufacturer profiles associated with Medical X-Ray Tube Anode Assembly.

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Frequently Asked Questions

What is the typical anode disk diameter range?

The anode disk diameter typically ranges from 70 to 120 mm, depending on the tube design and application. Verify the exact value for your specific model with the manufacturer.

What materials are used in the anode assembly?

The target surface is made of tungsten-rhenium alloy, the stem is molybdenum (often TZM grade), the rotor is copper, and graphite may be used for heat storage. These materials are selected for thermal and mechanical performance.

What is the maximum rotational speed?

The maximum rotational speed is typically between 3000 and 10000 rpm. This range depends on the bearing system and tube design. Confirm the rated speed for your application.

How does the anode angle affect X-ray production?

The anode angle (12-17 degrees) influences the focal spot size and heat distribution. A smaller angle reduces the effective focal spot but increases heat load per area. The optimal angle is determined by the imaging requirements.

Data Basis

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Preliminary Technical Classification

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pressure:	High vacuum (10^-4 to 10^-7 Pa) required for operation
other spec:	Maximum rotational speed: 3000-10000 RPM (depending on design), Heat dissipation capacity: 1-5 kW (continuous), Electron bombardment energy: 20-150 keV
temperature:	Ambient to 1500°C (anode surface during operation)

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