Tungsten alloy as a kind of medical radiation-proof material begin to be widely used because people gradually pay attention to the harm of radiation in medical devices for radiotherapy. It means that tungsten alloy having the characteristics of high melting point, high density, high temperature oxidation resistance, long service life and resistance to corrosion is promising as a radiation shielding material.
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According to the experts, the ability of metal materials to absorb X-rays and γ-rays is proportional to their density. Therefore, in the past, lead with a density of 11.3 g/cm3 is often chosen as a medical radiation-proof material. Now, these lead shields are replaced by high density tungsten alloy shields with a density of more than 17g/cm3 that have more ideal radiation absorption capabilities. Studies have shown that the shielding effect of tungsten alloy on radiation is more than 1.5 times that of lead. Moreover, the hardness of lead is not so high as tungsten alloy. More importantly, heavy metal lead can pollute the environment and is harmful to humans. While tungsten alloy is a non-toxic and environmentally-friendly alloy. Therefore, tungsten alloy has become an ideal medical radiation-proof material.
