Jaw Blade: length 150-300 mm, height 80-120 mm

Component Specifications

Definition

A high-density tungsten alloy component that forms part of the collimator jaw assembly in radiation therapy machines. These blades move independently to create precisely shaped radiation fields by blocking unwanted radiation, ensuring accurate targeting of tumors while minimizing exposure to healthy tissues. They operate within multi-leaf collimator systems for intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT).

Working Principle

Operates by linear motion along orthogonal axes to create rectangular or irregular radiation field shapes. Each jaw blade pair moves symmetrically from the central axis, with independent computer-controlled positioning to achieve sub-millimeter accuracy. The high-density tungsten material attenuates photon beams through photoelectric absorption and Compton scattering, with thickness calculated to provide required attenuation (typically 5-7.5 cm for 6-18 MV beams).

Materials

Tungsten alloy (W-Ni-Cu or W-Ni-Fe), 90-97% tungsten content, density 17-18.5 g/cm³, with nickel/copper/iron binder. Surface finish: ground to Ra 0.4 μm or better. Optional coatings: titanium nitride for wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Height	80-120 mm
Length	150-300 mm
Thickness	50-75 mm
Surface Flatness	≤0.1 mm
Positioning Speed	1-3 cm/s
Radiation Leakage	<0.5% of primary beam
Attenuation Factor	>1000:1 for 6 MV beams
Positioning Accuracy	±0.5 mm

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

Standards

ISO 13485, IEC 60601-2-1, ISO 14971

Parent Products

This component is used in the following industrial products

Collimator Jaws

Movable metal blocks in a collimator system that shape and define the radiation field.

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Engineering Analysis

Risks & Mitigation

Mechanical wear affecting positioning accuracy
Radiation leakage from material defects
Thermal expansion causing dimensional changes
Corrosion in humid environments

FMEA Triads

Trigger: Wear in drive mechanism components
Failure: Positioning inaccuracy exceeding ±1 mm
Mitigation: Regular calibration checks, use of wear-resistant materials in contact surfaces, preventive maintenance schedules

Trigger: Material impurities or voids
Failure: Increased radiation leakage >1%
Mitigation: 100% material certification, radiographic testing during manufacturing, quality control for density uniformity

Trigger: Thermal cycling during operation
Failure: Dimensional changes affecting field symmetry
Mitigation: Temperature compensation algorithms, thermal isolation, material selection with low thermal expansion

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Positioning: ±0.5 mm, Flatness: ≤0.1 mm, Parallelism: ≤0.05 mm over 100 mm

Test Method

Laser interferometry for positioning accuracy, radiation film dosimetry for field edges, CT scanning for material integrity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Supplier transparency

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Manufacturers of Jaw Blade

Manufacturer profiles associated with Jaw Blade.

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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

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Frequently Asked Questions

What is the primary function of jaw blades in collimators?

Jaw blades define the radiation field shape by blocking unwanted radiation, creating precise rectangular or irregular fields for accurate tumor targeting while protecting healthy tissues.

Why are tungsten alloys used for jaw blades?

Tungsten alloys provide optimal radiation attenuation due to high density (17-18.5 g/cm³) and atomic number, allowing thinner components with equivalent shielding compared to lead or steel.

How do jaw blades differ from multi-leaf collimators?

Jaw blades create rectangular fields with two pairs of opposing blades, while MLCs use many small leaves for complex shapes. Jaws often provide primary field definition with MLCs adding finer modulation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Jaw Blade