Tungsten carbide reinforced aluminum matrix composite material is a new radiation protection material. Its γ-ray and neutron shielding performance is more excellent than lead. It also has the advantages of high specific stiffness, high specific strength, excellent plasticity, and high stability. More importantly, it is environmentally friendly. So, this new type of radiation protection material is widely used in medical shielding and other fields.

As a ray shielding material, tungsten-based composite material does not have the disadvantages of secondary toughening radiation, low hardness, and toxicity that exist in lead alloys and lead-containing glasses. Therefore, tungsten-based composite material is regarded as a potential substitute for lead to be used in medical shielding.

Non-toxic and environmentally-friendly tungsten heavy alloy is an ideal anti-radiation material for applying in the field of medical shielding. Tungsten heavy alloy is a ternary alloy composed of 90-98% W and a small amount of Ni, Fe or Cu. There are mainly two series of tungsten heavy alloys including W-Ni-Fe alloy and W-Ni-Cu alloy.

Tungsten alloy leaf can be applied to multileaf collimator - an important part of medical linear accelerator. And there are many tungsten alloy leaves arranged closely to replace a whole lead block on the head of accelerator. The distance between each tungsten alloy leaf is very small. If dust particles or other dirty things settle on tungsten alloy leaves, it will cause the multileaf collimator to malfunction, so these leaves should be cleaned. Well, how to clean tungsten alloy leaf of multileaf collimator?