Ionizing radiation refers to electromagnetic radiation and ionizing radiation which can make atom or atomic group produce ionization. Electromagnetic radiation which can cause ionization contains X-ray and γ-ray. Ionizing radiation contains α-ray, β-ray, neutron, proton and other charged particle. In nuclear medical, primary source of radioactivity is various kind of radioactive medicine, unsealed source also called as open source. Its characteristic is spreading easily and polluting working space and environment. Working space of operating unsealed source has externalir radiation exposure caused by X-ray, γ-ray andβ-ray. It also has internal radiation exposure caused by radionuclide which is produced by radioactive pollution entering into organism.

In recent years, PET/CT centers have been established in some large medical therapy units gradually, in China. Source of radioactivity is more complicated. It comes from the externalir radiation exposure and internal exposure radiation caused by radionuclide of positron which utilized by tungsten alloy PET and marked medicine. It also comes from externalir radiation exposure produced by tungsten alloy CT. It even comes from externalir radiation exposure and induced radioactivity caused by small cyclotron when producing radioactive element and internal radiation exposure caused by pollution of radionuclide. Tungsten alloy radiation shielding can be used for protecting doctors and patients from ionizing radiation.


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Tungsten poly combines tungsten powder and poly, so it has the good properties of tungsten alloy and poly, such as: high radiation shielding, high temperature resistance, high density, low cost, non-toxic and environmentally friendly.

As these good advantages , tungsten poly is the best material and first choice to make radiation shielding. Compared with lead in radiation shielding material, tungsten poly weights less than lead, tungsten poly radiation shielding is more durable than other lead substitutes and offers equal or better radiation shielding capabilities, the most important point is that tungsten poly is lead-free, and non-toxic, so more and more radiation shielding are made from tungsten material instead of lead, especially the radiation shielding used in medical field such as: tungsten poly collimator, tungsten poly PET, tungsten poly syringe shielding and so on.


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Swaged tungsten rods are frequently swaged. After the centerless grinder proces, the surface intergrity and accuracy of the diameter are improved. They can be produced in a variety of near-final shapes, but the most frequently encountered shape is cylindrical rods.

After being swaged, tungsten rods will greatly enhance their tensile strength from 1050 MPa to 1200 MPa at least. Tungsten swaging rods are produced by Forging and sintering tungsten rods into billets and swaging into rods.

Features:
1.Swaged tungsten rod's tensile strength is better than the same kind of tungsten alloy rod;
2.The diameters of tungsten alloy rod through swaging can reach 3mm or larger;
3.The single weight of the common rod can reach 100 kilograms.

Advantages of Swaged Tungsten Rods:
Titanium is also a popular used material for producing swaging rod. It possesses high strength, toughness, durability, corrosion resistance and biological compatibility physical qualities. However, Titanium's density is much lower than tungsten, which makes it difficult in the situation of needing high mass with limited volume. Relatively speaking, swaged tungsten rod is with high density, high melting point, excellent hardness, high tensile strength, high temperature resistance, superior wearing resistance and low vapor pressure. Therefore, swaged tungsten rod gradually stands out among the various swaging rod making materials.

Parameter of Swaged Tungsten Rods:
Diameter (mm)    Length (mm)
Ø3.0 - 6.0           ＞6000
Ø6.0 - 10.0         ＞5500
Ø10.0 - 15.0       ＞4000


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The tungsten iridium stream mouth is as a special tungsten heavy alloy with other refractory metals. It mainly uses in rare-earth metal smelting, the induction furnace heating element, the quartz glass smelting and so on, makes the high temperature vessel.

In the glass and the ceramic industry, the tungsten iridium stream mouth is a ceramic micro production very essential part. The tungsten proportion is big, degree of hardness is big, the heat conduction electric conductivity good, heat-resisting, wear-resisting, anti-corrosive, has the low expansibility and the size stability under the high temperature. The tungsten melting point is highest when all metals (reaches as high as 3380 degrees Celsius), the steam tension to be lowest, the tensile strength is highest (1650°C), and its antiseptic property is good, the majority inorganic acid are very small to its corrosion. Therefore it is ideal to manufacture heavy alloy. But the tungsten and the iridium make the alloy, its abrasion resistance, degree of hardness, the intensity, the heatproof quality obtained the further promotion, thus has guaranteed the product uniformity well. Is precisely these precious performance, causes it to become now in the high-tech crystal glass industry the indispensable equipment component.


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