Tungsten Alloy Shielding for Irradiation Linac

Tungsten alloy shielding is necessary for irradiation linac. Electrons caused by irradiation linac are shielded easily for having small exit range. But they can cause strong bremstrahlung, being resisting by components of irradiation linac, cable as irradiated target, barrier plate, floor or other materials. Maximum energy of bremmstrahlung is possible maximum electron energy. Generally, irradiation linac will not cause photonuclear reaction and induced radioactivity, if energy is no more than 10MeV. For that, bremsstrahlung (X-ray) is primary target which must be shielded for irradiation linac.

Emissivity of X-ray caused by irradiation linac is relevant to electron energy, beam intensity, atomic number of target material, thickness of target or other factors and it changes with exit angle. For definite target material Z and thickness of target, emissivity of X-ray which is corresponding to unity beam intensity increases significantly with the increasing energy of accelerated electron and angular distribution of emissivity also changes with the increasing of electron energy.

Lead is used as traditional raw materials for radiation shielding. But lead has toxicity which may cause pollution. The density of tungsten alloy is higher than lead by 60%. The high density of tungsten alloy shielding allows a reduction in physical sizes of shielding components, without compromising effectiveness of shielding characteristics. Otherwise, tungsten alloy shielding has the advantages of non-toxicity. So compared with, tungsten alloy is more suitable for irradiation linac to shield against X-ray.



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