Tungsten heavy alloy is also called tungsten alloy. The main component of tungsten alloy can be W-Ni-Fe, W-Ni-Cu or W-Ni-Cu-Fe, among which other metals such as cobalt, molybdenum, and chromium can also be added. The density of tungsten heavy alloy is twice that of steel, and 1.5 times of lead (conventional radiation shielding material). Moreover, tungsten alloy is an environmentally friendly material, which is non-toxic and pollution-free, so it is more suitable for collimator applications as a radiation protection material than heavy metal lead.
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Tungsten alloy collimator is mainly divided into low-energy collimator, medium-energy collimator, and high-energy collimator according to the level of energy. Wherein, the energy of a gamma photon suitable for a low-energy collimator is less than 150 keV, the medium-energy collimator is used for imaging of a photon with an energy of 150 keV to 350 keV, and the photon higher than 300 keV requires a high-energy collimator for scanning.
