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Gamma ray collimator
The ability of metal materials to absorb X-rays and gamma rays is proportional to their specific gravity. Previously, lead was widely used as a shielding material, the density of lead is 11.3g/cm3, while the density of tungsten alloy is more than 18g/cm3, so tungsten alloy has a stronger absorption of X-rays and gamma rays than lead, and the shielding capacity is more than 1.5 times that of lead. And lead material soft, easy to damage, and tungsten alloy hardness is high, the material is not easy to deformation damage. In addition, lead itself is toxic, and tungsten alloy materials are non-toxic and environmentally friendly. In summary, tungsten alloy has been widely used as a shield material to replace lead.
It is the best radiation shielding material in the medical field. Typical applications include radioactive source containers, collimators, radioisotope containers, syringe protective covers, etc.
The shielding parts (collimator, multi-blade grating, etc.) on radiotherapy equipment such as medical electron linear accelerator and cobalt-60 therapy machine are made of tungsten alloy material. Tungsten alloy shielding can narrow the particle beam or light wave so that the particle rays shine in a specific direction, even if the space section of the beam becomes narrower to limit the amount of rays.
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