Tungsten alloy collimator is widely used for radiotherapy. In China, radiotherapy was begun in 1930’s. Radium Hospital (Fudan University Shanghai Cancer Center), build in 1931 and Peking Union Medical College Hospital (having 200mg radium needle, a 200kV X-ray therapy apparatus and a 120kV X-ray therapy apparatus), build in 1932, were the first hospitals launching the earliest radiotherapy in China. At the end of 1950’s, China imported the first ⁶⁰Co therapy apparatus, high energy ray device. China imported the first betatron in 1968 and the first liner accelerator in 1975. In recent years, radiotherapy has developed unprecedentedly. All of new radiotherapy techniques are developed including three-dimensional stereotactic radiotherapy (gamma knife, X-ray knife, conformal therapy and intensity modulated radiotherapy). Researches on tumor radio physics and radio biology also achieve fruitful results. In recent years, hospitals adding radiotherapy in every province, city, prefecture-level city, county-level city even small towns are more and more. Radiotherapy equipments are more and more advanced.

Tungsten alloy collimator is used for guiding X-ray to protect patients and doctors from radiation. Density of tungsten alloy is higher than lead by 60%. The high density allows a reduction in physical sizes of collimator without compromising effectiveness of shielding characteristics. Otherwise, tungsten alloy has the advantage of non-toxicity. So tungsten alloy is more suitable for collimator, compared with lead.


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The high proportion of raw materials for production to clean the metal tungsten alloy counterweight block is pollution-free, in line with international environmental standards, proportion (> 18g/cm3), small size. Therefore, resistance to strong winds, light into the water, sinking fast, and sinker the best alternative to products sold in Europe and other developed countries.

Tungsten alloy counterweight block including: tungsten alloy golf weight, car weight of tungsten alloys, tungsten alloys and fishery pendant with heavy tungsten alloy ship weight, tungsten alloy aircraft weight and so on.


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Metal Injection Molding (MIM) is a growth technology for manufacturing complex-shaped,high-volume metal or alloy parts. Metal Injection Molding (MIM) parts can be produced from ferrous and non-ferrous metals and alloys.

The advantages of Metal Injection Molding (MIM)
Density: Typically 95-98% of wrought material. Mechanical Properties - Comparable to wrought alloys of similar composition. Complexity - Geometries comparable to plastic injection molding. Surface Finish: As processed, 32 ram or better. Corrosion Resistance - Comparable to wrought alloys of similar composition. Alloy Selection - Many ferrous, nickel-based and copper-based alloys available.


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Tungsten fishing weight is an ideal, environment-friendly alternative to lead weight, which are toxic and increasingly being labeled an environmental hazard.

As the high density of tungsten, the tungsten fishing weight makes your fishing easier. It is extremely sensitive and can actually help you "feel" what the bottom is made of and what your bait is bumping into, such as brush, rocks, mud, etc.


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Tungsten alloy fishing weight has many advantages such as high density with small volume, good corrosion resistance, perfect hardness,etc.

High density make tungsten alloy fishing weight smaller than the conventional lead fishing weight. It will be hung up far less with a tungsten sinker than with a lead sinker because of its smaller size.


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Tungsten alloy bar has the good properties of high density with small volume, perfect hardness, non-toxic and environmentally friendly, so it is widely used as counterweight.

Followings are physical properties of tungsten alloy bar:
1, Width×Length: (2.0-100.0mm)×(2.0-100.0mm)
2, High: 50-1000mm
3, Density: 15.8-18.75 g/cm3
4, W content: 85-99%
5, Composition: W-Ni-Fe, W-Ni-Cu



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Tungsten alloy fishing weight has so many good properties.

Tungsten alloy fishing weight is small size and large proportion (> 18g/cc). They are against strong wind, light into the water, sinking fast, and are the best alternative to lead sinkers. Compared to lead fishing weight tungsten alloy fishing weight is non-toxic and environmentally friendly, so it is best-selling in Europe, the United States and other developed countries.


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The most common packaging for Tungs-tone needles was a tin box that holds eight needles. The tins came later. When the "Tungs-tone" was introduced in 1916, the needles came in a punch-out card. The earliest ad I have seen for this new Victor product is from June 1916. There was trouble over the name when it was registered with the Patent Office, we learn from the August 15, 1916 issue of Talking Machine World. An article states, "The word was rejected by the United States Examiner of Trade-Marks at Washington until he was instructed from the office of the United States Commissioner of Patents to rule differently." The trade-mark examiner felt "Tungs-tone" was too close to "tungsten." In a similar ruling, "Tungsteel" was judged no good for razors and pocket knives. Anyway, Victor was allowed to use the name, and early ads always use a capital letter (Tungs-tone, not tungs-tone), giving the product more dignity.

A Tungsten or Tungs-Tone is a type of phonograph stylus. They are constructed from tungsten wire, which is held in a metal shank. Unlike a steel stylus, a tungsten stylus has a cylindrical rather than a conical shape, meaning that the cross-section of the stylus remains the same as the stylus wears down, which in turn means that tungsten styluses may be used for several plays.

Typically, a new steel needle is required for every record played on an old acoustic phonograph. This is because the record contains abrasive material. In the first few silent tracks this abrasion hones the steel needle to a profile that tracks the grooves properly. The needle continues to wear as it plays the record, so that by the end its diameter has increased to the point where the sharp edges may damage the grooves on subsequent plays.


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In neutron, X-ray and gamma ray optics, a tungsten alloy collimator is a device that filters a stream of rays so that only those traveling parallel to a specified direction are allowed through. Tungsten alloy collimator is used in neutron, X-ray, and gamma-ray optics because it is not yet possible to focus radiation with such short wavelengths into an image through the use of lenses as is routine with electromagnetic radiation at optical or near-optical wavelengths. Tungsten alloy collimator is also used with radiation detectors in nuclear power stations for monitoring sources of radioactivity.

For industrial radiography using gamma radiation sources such as Iridium-192 or Cobalt-60, a tungsten alloy collimator allows the radiographer to control the exposure of radiation to expose a film and create a radiographic "negative", a.k.a., a radiograph, to inspect materials for defects. A tungsten alloy collimator in this instance is most commonly made out of tungsten, and is rated according to how many half value layers it contains, i.e., how many times it reduces undesirable radiation by half. For instance, the thinnest walls on the sides of a 4 HVL tungsten collimator 0.52" thick will reduce the intensity of radiation passing through them by 88.5%. The shape of these collimators allows the radiographer to direct the radiation to the film and away from other workers.

Therefore, tungsten alloy products for collimators are widely used in linear accelerators used for radiotherapy treatments. They help to shape the beam of radiation emerging from the machine, they can limit the maximum field size of a beam. The treatment head of a linear accelerator consists of both a primary and secondary collimator. The primary collimator is positioned after the electron beam has reached a vertical orientation. When using photons, it is placed after the beam has passed through the X-ray target. The secondary collimator is positioned after either a flattening filter (for photon therapy) or a scattering foil (for electron therapy). The secondary collimator consists of two jaws which can be moved to either enlarge or minimize the size of the treatment field.



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Tungsten nylon is the best material of radiation shielding instead of lead because tungsten nylon has the good properties of tungsten that is high density, high radiation resistance and the properties of nylon that is easily machined, high tensile strength and malleable, etc. Nylon tungsten is more durable than other lead substitutes and offers better radiation shielding capabilities in electronic and electrical products.

Because tungsten nylon is malleable, tungsten nylon offers increased design flexibility and the opportunity to create molded parts in lieu of multi-part assemblies. As tungsten nylon is non-toxic and environmentally friendly, tungsten nylon is the first choice to make radiation shielding which is widely used in medical areas such as tungsten collimator and industry areas. Tungsten collimator is a kind of tungsten nylon product.


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