Tungsten alloy is used for shielding against X-ray in medical. With the development of radiation shielding for X-ray equipment, especially constantly carrying out radiation shielding and safety regulation or standard, awareness of radiation shielding is strengthened in generally. Now accidents caused by X-ray are few. However, in the past, if did not notice intermittent exposure to control irradiation of X-ray, it may cause radiation injury to the skin of patient and medical staffs’ hands when utilizing fluoroscopic viewing to carry out fracture reduction and searching foreign matter inside body. At the beginning of 1980’s, one hospital in China used 10mA portable X-ray equipment which had low effectiveness of shielding to search the bullet in buttock of a child who shot by air pistol. Medical staffs were lack of knowledge about radiation shielding and time of fluoroscopic viewing was too long. That caused II~III degree acute radiation burning accident to part skin of child. The child accepted symptomatic treatment in hospital for several moths and also needed skin grafting after half a year. It also happened that medical staffs could not control fluoroscopic viewing time, resulting in over irradiation of X-ray to medical staffs’ hands and radiation injury when carrying out fracture reduction and searching foreign matter inside body.

Traditionally, lead was used as raw material for radiation shielding. However, lead had toxicity which may cause pollution. The density of tungsten alloy is higher than lead by 60%. High density of tungsten alloy allows a reduction in physical sizes of shielding components without compromising effectiveness of shielding characteristic. Otherwise, tungsten alloy has the advantage of non-toxicity. Tungsten alloy is suitable for radiation shielding.



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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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Tungsten is a very unique metal with very unique characteristics. Tungsten is a very heavy metal. In fact, tungsten derives its name from the Swedish words tung and sten, which means “heavy stone”. In terms of weight compared to lead, a cubic inch of lead weighs half as much as a cubic inch of tungsten. Just to put in as a perspective, a cubic inch of lead weighs about six and a half ounces (a little less than half a pound).

Much has been said about tungsten’s toughness and high durability, but it is also pretty brittle. In fact, it is possible to cut a piece of with a hacksaw. Some tungsten wedding bands have been known to break if dropped from a fairly high distance. Nonetheless, tungsten carbide is still one of the toughest and strongest of all metals known to man.

One of tungsten’s most amazing characteristics comes from its ability to withstand heat. With the exception of carbon, tungsten has the highest melting point of all elements. Tungsten has a melting point (the point where it changes from a solid to a liquid) of 6,152 degrees Fahrenheit (3,410 degrees Celsius). At 4,982 degrees Fahrenheit, another “tough” metal – Iron – is already boiling. At high temperatures, tungsten keeps its profound strength and does not begin to expand nearly as much as other metals. Because of its ability to remain strong under high temperatures, tungsten is used in space travel.

Another interesting characteristic of tungsten is that it does not react with many other substances including acids. Tungsten is resistant to most acids, which also aids in the jewelry industry. The lack of reaction with acids and other elements prevents your finger from turning green.



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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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