X-ray Target for Medical Linear Accelerators

Product Specifications

Technical details and manufacturing context for X-ray Target

Definition

The X-ray target is a critical component within a medical linear accelerator (LINAC) used in radiation therapy. It serves as the conversion point where high-energy electrons from the accelerator are directed to produce therapeutic X-rays through bremsstrahlung radiation. This component is typically located in the treatment head assembly and is essential for generating the photon beams used in external beam radiation therapy for cancer treatment. The target is made from materials with high atomic numbers and high melting points, such as tungsten, tungsten alloys, or tantalum, to withstand the intense heat generated by electron bombardment. Key parameters include target material (e.g., tungsten-rhenium alloy per ASTM B760), diameter (50–100 mm), thickness (1.0–2.5 mm), surface roughness (≤0.8 μm Ra per ISO 4287), density (19.2–19.4 g/cm³ per ASTM B311), thermal conductivity (170–190 W/(m·K) per ASTM E1461), melting point (3400–3450 °C), operating temperature (20–2000 °C), cooling water flow rate (10–20 L/min), cooling water pressure (0.3–0.5 MPa), flatness (≤0.05 mm per ISO 1101), parallelism (≤0.03 mm per ISO 1101), and weight (0.5–2.0 kg). These values are typical reference ranges and must be verified for the specific model and application. The target is designed to convert electron kinetic energy into X-ray photons efficiently while managing heat dissipation through water cooling. Proper selection and verification of these parameters are essential for reliable operation and consistent X-ray output. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

High-energy electrons from the linear accelerator are focused and accelerated toward the X-ray target. When these electrons strike the dense material of the target, they decelerate rapidly, converting their kinetic energy into X-ray photons through the bremsstrahlung (braking radiation) process. The resulting X-ray beam is then collimated and shaped for precise delivery to the treatment area. The target's material and geometry are optimized to balance X-ray yield and heat dissipation, with cooling water flowing through the assembly to maintain safe operating temperatures.

Common Materials

Tungsten, Tungsten alloy, Tantalum

Technical Parameters

Parameter	Typical range	Notes & selection driver
Target Material	W-Re	Tungsten-rhenium alloy for high thermal resistanceASTM B760
Target Diameter	50–100 mm	Matches electron beam spot size
Target Thickness	1.0–2.5 mm	Balances X-ray yield and heat dissipation
Surface Roughness	≤0.8 μm Ra	Affects electron scattering and coolingISO 4287
Density	19.2–19.4 g/cm³	Near full density for thermal conductivityASTM B311
Thermal Conductivity	170–190 W/(m·K)	High for heat removalASTM E1461
Melting Point	3400–3450 °C	Withstands electron beam heating
Operating Temperature	20–2000 °C	Peak temperature during operation
Cooling Water Flow Rate	10–20 L/min	Required to maintain temperature
Cooling Water Pressure	0.3–0.5 MPa	Ensures adequate flow
Flatness	≤0.05 mm	Critical for uniform X-ray outputISO 1101
Parallelism	≤0.03 mm	Ensures consistent thicknessISO 1101
Weight	0.5–2.0 kg	Depends on size and thickness

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

Target disc Part
Primary material that converts electron energy to X-rays through bremsstrahlung radiation

Material: Tungsten or tungsten alloy
Cooling system interface
Manages heat dissipation from the target during operation to prevent overheating and damage

Material: Copper or aluminum with cooling channels
Mounting assembly
Secures the target in precise alignment with the electron beam path

Material: Stainless steel or titanium

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Frequently Asked Questions

What materials are commonly used for X-ray targets?

Common materials include tungsten, tungsten alloys (such as tungsten-rhenium), and tantalum. These materials have high atomic numbers and high melting points, making them suitable for withstanding the heat generated by electron bombardment.

What are the typical dimensions of an X-ray target?

Typical reference ranges are a diameter of 50–100 mm and a thickness of 1.0–2.5 mm. However, exact dimensions depend on the specific linear accelerator model and must be confirmed with the manufacturer.

How is the X-ray target cooled?

The target is typically cooled by water flowing through channels in the assembly. Reference flow rates are 10–20 L/min at a pressure of 0.3–0.5 MPa. Adequate cooling is essential to maintain the target's temperature within its operating range of 20–2000 °C.

What standards apply to X-ray targets?

Relevant standards include ASTM B760 for tungsten-rhenium alloy, ISO 4287 for surface roughness, ASTM B311 for density, ASTM E1461 for thermal conductivity, and ISO 1101 for flatness and parallelism. These standards serve as verification references; compliance must be confirmed with the supplier.

Data Basis

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Preliminary Technical Classification

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pressure:	High vacuum environment (10^-6 to 10^-8 Torr) required in accelerator chamber
other spec:	Electron beam energy: 6-25 MeV typical, power density: up to 10 kW/cm², cooling water flow: 2-10 L/min depending on design
temperature:	Up to 1500°C (target surface during operation), cooling required to maintain <100°C base temperature

X-ray Target

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