Collimator Jaws

Product Specifications

Technical details and manufacturing context for Collimator Jaws

Definition

Collimator jaws are precision-engineered, adjustable metal components within a collimator system, typically used in radiation therapy and imaging equipment. They function as movable barriers or shutters that physically limit and shape the beam of radiation (such as X-rays or particle beams) by moving independently along orthogonal axes to create rectangular or irregular field apertures. Their primary role is to precisely control the size, shape, and direction of the radiation field to match the treatment or imaging target while minimizing exposure to surrounding healthy tissues. Constructed from high-density materials like tungsten alloy (W90), lead, or steel with radiation-absorbing lining, these jaws provide effective shielding. Key parameters include density (17.0–18.5 g/cm³), hardness (28–32 HRC), surface roughness (Ra 0.4–0.8 μm), flatness (0.02 mm), parallelism (0.03 mm), positioning accuracy (±0.05 mm), repeatability (±0.02 mm), maximum travel speed (50–100 mm/s), operating temperature (10–40 °C), relative humidity (30–75%), ingress protection (IP54), and weight per jaw (5–15 kg). These values are reference ranges and must be verified for the specific model and application. Standards such as ASTM B777, ASTM E18, ISO 4287, ISO 1101, ISO 230-2, IEC 60601-1, and IEC 60529 are listed as procurement or verification references, not as proof of certification. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Collimator jaws operate by mechanical or motor-driven translation along guide rails or tracks. They are positioned symmetrically in pairs (typically two pairs for X and Y axes) relative to the beam central axis. A control system moves each jaw pair independently based on input parameters (field size, shape). The jaws absorb or block radiation outside the desired aperture, with their inner surfaces often tapered or shaped to minimize penumbra (the fuzzy edge of the radiation field). In multi-leaf collimators (MLCs), individual leaves function similarly but allow more complex shapes.

Common Materials

Tungsten alloy, Lead, Steel with radiation-absorbing lining

Technical Parameters

Parameter	Typical range	Notes & selection driver
Material	Tungsten alloy (W90)	High density for radiation shieldingASTM B777
Density	17.0–18.5 g/cm³	Higher density improves shieldingASTM B777
Hardness	28–32 HRC	Wear resistanceASTM E18
Surface Roughness	Ra 0.4–0.8 μm	Smooth surface reduces scatterISO 4287
Flatness	0.02 mm	Ensures accurate field definitionISO 1101
Parallelism	0.03 mm	Maintains uniform gapISO 1101
Positioning Accuracy	±0.05 mm	Critical for treatment precisionISO 230-2
Repeatability	±0.02 mm	Consistent field settingsISO 230-2
Maximum Travel Speed	50–100 mm/s	Affects treatment time
Operating Temperature	10–40 °C	Outside range may affect accuracyIEC 60601-1
Relative Humidity	30–75 %	Condensation must be avoidedIEC 60601-1
Ingress Protection	IP54	Dust and splash water protectionIEC 60529
Weight per Jaw	5–15 kg	Affects drive sizing

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

Jaw Blade Part
Primary radiation-absorbing block that defines one edge of the field

Material: Tungsten alloy or lead composite
Drive Mechanism
Motor, gears, or actuators that move the jaw along its track

Material: Steel, aluminum, precision bearings
Position Sensor
Encoders or potentiometers that provide feedback on jaw position

Material: Electronic components, plastic housing
Mounting Bracket Part
Structural frame that holds the jaw assembly within the collimator head

Material: Aluminum or steel alloy
Guide Rails
The track each jaw slides along, so its travel stays square to the beam axis.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Collimator System

View system integration details

Manufacturers of Collimator Jaws

Manufacturer profiles associated with Collimator Jaws.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What materials are collimator jaws typically made of?

Common materials include tungsten alloy (W90), lead, and steel with radiation-absorbing lining. The choice depends on the required shielding and mechanical properties.

How do collimator jaws achieve precise field shaping?

They move independently along orthogonal axes via motor-driven translation, controlled by a system that adjusts each jaw pair based on desired field size and shape. Inner surfaces are tapered to reduce penumbra.

What are the key performance parameters to verify?

Important parameters include density, hardness, surface roughness, flatness, parallelism, positioning accuracy, repeatability, travel speed, operating temperature, humidity, ingress protection, and weight. These must be confirmed for the specific model.

Are the listed standards certifications?

No. Standards like ASTM B777, ISO 1101, and IEC 60601-1 are references for procurement and verification. They do not guarantee that a product or supplier is certified. Always verify compliance with the legal manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar absolute
other spec:	Radiation field size: 0.5x0.5 cm to 40x40 cm, Positioning accuracy: ±0.5 mm, Reproducibility: ±0.2 mm
temperature:	0°C to 50°C (operating), -20°C to 70°C (storage)

Product Specifications

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