High-Density Tungsten Alloy Collimator
- High density 17.0–18.5 g/cm³ — 1.5–1.6× denser than lead (11.34 g/cm³) for superior shielding in thinner profiles
- Tungsten content 90–97% with W-Ni-Fe or W-Ni-Cu binders
- Linear attenuation coefficient 0.15–0.18 cm⁻¹ (Co-60, 1.25 MeV) — outperforms lead (0.09–0.12 cm⁻¹)
- Shielding efficiency up to 97% with 5mm thickness
- Excellent mechanical strength: tensile strength >1000 MPa, Vickers hardness 320–400 HV
- Reduced secondary radiation — suppresses characteristic X-ray generation
- Environmentally friendly and non-toxic — lead-free alternative
- Available in multiple configurations: single-hole, multi-hole, parallel-hole, pinhole, multi-leaf (MLC), and custom designs
Description Of High-Density Tungsten Alloy Collimator
High-Density Tungsten Alloy Collimator is a high-performance radiation beam control and shielding device manufactured from tungsten-based heavy alloy. The core material typically consists of high-density tungsten (90–97% by weight) combined with low-melting-point metals such as nickel, iron, or copper as binders. The resulting material density ranges from 17.0 to 18.5 g/cm³ — approximately 1.5 to 1.6 times that of lead (11.34 g/cm³) — enabling superior radiation absorption and shielding within a compact form factor.
The basic function of a collimator is to guide and limit the radiation beam through precise geometric design (such as apertures, slots, or multilayer structures), ensuring beam directionality and improving the accuracy of imaging or treatment. The rationale behind tungsten alloy collimators is based on the high atomic number of tungsten (Z=74) and its high density. The attenuation of X-rays, gamma rays, and neutron beams follows the exponential decay law. Experimental data shows that under a Co-60 source (1.25 MeV), the linear attenuation coefficient (μ) of tungsten alloy collimators is 0.15–0.18 cm⁻¹, outperforming lead (0.09–0.12 cm⁻¹). A 5 mm thick sample can achieve shielding efficiency of up to 97%, significantly reducing scattered radiation.
Compared to traditional lead-based collimators, high-density tungsten alloy collimators offer multiple advantages: higher shielding efficiency at thinner thicknesses, excellent machinability for complex geometries (single-hole, multi-hole, parallel-hole, pinhole, and multi-leaf designs), superior mechanical strength and durability (tensile strength >1000 MPa, hardness 320–400 HV), environmental friendliness and non-toxicity, and better thermal stability (thermal conductivity ~174 W/m·K) under prolonged high-energy irradiation.
High-density tungsten alloy collimators are available in a wide range of configurations — including single-hole, multi-hole, parallel-hole, pinhole, multi-leaf (MLC), and custom designs — to meet diverse application requirements across medical, industrial, and scientific fields.
Features Of High-Density Tungsten Alloy Collimator
Superior Radiation Attenuation: Tungsten’s high atomic number (Z=74) and the high density of tungsten alloys (17.0–18.5 g/cm³) provide exceptional photoelectric absorption and scattering cross-sections for X-rays and gamma rays. Under a Co-60 source (1.25 MeV), tungsten alloy demonstrates a linear attenuation coefficient of 0.15–0.18 cm⁻¹, outperforming lead (0.09–0.12 cm⁻¹). A 5 mm thick sample can achieve shielding efficiency up to 97%.
High Density — Compact Design: With density 1.5–1.6 times that of lead (11.34 g/cm³), tungsten alloy achieves equivalent shielding effectiveness with significantly thinner material thickness. This "thinning" advantage is critical in space-limited applications such as portable medical devices and compact detection equipment.
Excellent Mechanical Strength: Tungsten alloy offers exceptional mechanical properties: tensile strength >1000 MPa (up to 1200–1500 MPa for W-Ni-Fe alloys) and Vickers hardness of 320–400 HV, far exceeding traditional lead (hardness ~50 HV) and aluminum alloys (tensile strength 300–400 MPa). Fatigue limit exceeds 800 MPa (10⁷ cycles), ensuring long-term reliability under high-frequency vibration or cyclic loading.
Reduced Secondary Radiation: Rational composition ratios and microstructured inner walls significantly reduce the generation and escape of characteristic X-rays and scattered photons, improving imaging quality.
Excellent Machinability: Tungsten alloy is easy to machine and can be processed through CNC milling, drilling, electrical discharge machining, or ultrasonic processing to create complex geometric hole arrays and high aspect-ratio channels. Precision grinding achieves tolerances as tight as 0.03mm.
High Thermal Stability and Corrosion Resistance: With high thermal conductivity (~174 W/m·K) and excellent corrosion resistance, tungsten alloy maintains structural stability under prolonged high-energy radiation exposure and resists degradation in harsh environments.
Environmentally Friendly and Non-Toxic: Tungsten alloy is non-toxic and lead-free, fundamentally eliminating the health and environmental risks associated with lead during use, processing, and disposal. It fully complies with stringent biosafety and environmental regulations for medical devices and nuclear instruments.
Customizable Configurations: Available in single-hole, multi-hole, parallel-hole, pinhole, multi-leaf (MLC), and custom designs. Flexible control of channel geometry allows both narrow fields of view to suppress background noise and moderate widening to balance flux.
Specifications Of High-Density Tungsten Alloy Collimator
Available Configurations: