Scheelite is a calcium tungstate mineral with the chemical formula CaWO₄. It is an important ore of tungsten. Well-formed crystals are sought by collectors and are occasionally fashioned into gemstones when suitably free of flaws. Scheelite has been synthesized via the Czochralski process; the material produced may be used to imitate diamond, as a scintillator, or as a solid state lasing medium. It was also used in radium paint in the same fashion as was zinc sulphide, and Thomas Edison invented a fluoroscope with a calcium tungstate-coated screen, making the images six times brighter that those with barium platinocyanide; the latter chemical allowed Röntgen to discover X-rays in early November 1895.

 

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Tungsten X-ray shielding is the process of preventing radiation produced from X-rays reaching an unwanted place or person. Tungsten X-ray shielding or tungsten radiation protection is the science and practice of protecting people and the environment from the harmful effects of ionizing radiation.

Tungsten X-ray shielding is based on the principle of attenuation, which is the ability to reduce a wave’s or ray’s effect by blocking or bouncing particles through a barrier material. Charged particles may be attenuated by losing energy to reactions with electrons in the barrier, while X-ray and gamma radiation are attenuated through photoemission, scattering, or pair production. Neutrons can be made less harmful through a combination of elastic and inelastic scattering, and most neutron barriers are constructed with materials that encourage these processes.

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There are several factors that influence the selection and use of X-ray shielding materials. Considerations such as attenuation effectiveness, strength, resistance to damage, thermal properties and cost efficiency can affect radiation protection in numerous ways. For example, metals are strong and resistant to radiation damage, but they undergo changes in their mechanical properties and degrade in certain ways from radiation exposure. Likewise, concretes are strong, durable and relatively inexpensive to produce, but become weaker at elevated temperatures and less effective at blocking neutrons.

In most cases, high-density materials are more effective than low-density alternatives for blocking or reducing the intensity of radiation. However, low-density materials can compensate for the disparity with increased thickness, which is as significant as density in shielding applications. Due to tungsten material has high density, excellent radiation attenuation properties and environmental friendly. Tungsten can be good choice to produced tungsten X-ray shielding.

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One of the important parts of examine the microstructure is analyzing the defect of tungsten points. to You can check the quality of products on the basis of the standards and its material microstructure of tungsten points. The determination of its defect type and size could be available according to the distribution of its microstructure and check whether they satisfy the requirements of tungsten points’ specification.

The defect types of tungsten points are listing as follows: pores, inclusions, porous holes, bubbling, squeezing cracks, and unevenly distributed organization, purity of tungsten points’ material, delaminating cracks or the particle size and morphology of tungsten powder... There are problems of the process, because the reason is complicated, you should comprehensively analyze and resolve them.

One way to test the quality of metal materials is microstructure analysis; it adopts the principle of quantitative metallography.

Defect types and sizes of tungsten points’ materials may also be relevant to production processes and other causes; therefore, the analysis of the causes of the defect phenomenon can be as a reference to improve product quality.



 

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