What is ammonium metatungstate? Ammonium metatungstate, AMT for short, is a white or slightly yellow crystal powder that is soluble in water and insoluble in ethanol. AMT is an important intermediate compounds of tungsten hydrometallurgical process. Its chemical formula is (NH4) 6H2W12O40·XH2O, molecular formula is H8N2O4W, and molecular weight is 283.9145.

Tungsten alloy shield is a new type of lead-free shield with excellent shielding performance to X-rays so that it is mainly applied for mobile CT machine. Moreover, it is environmentally friendly and non-toxic, and will not affect the water, soil and air in the environment. It has been reported that mobile CT machine is used in mobile cabin hospitals because of its flexibility, efficiency and convenience, and patients can be examined nearby. A chest CT takes less than 3 minutes. The application of this highly sophisticated equipment has played an important role in satisfying first-line treatment.

Tungsten alloy radiation shielding door is a protective door made using tungsten alloy plate as a shielding part for applications in the CT room. Tungsten alloy radiation shielding door has a higher radiation shielding effect than the traditional lead door, and is environmentally friendly and non-toxic. Also, it will not pollute the environment, and can be recycled, so tungsten alloy door is the most popular lead-free radiation protection door.

Tungsten alloy sheet is necessary for radiation protection of CT room. What is the most important device in the CT room? CT scanner. While there are X-rays. And there is a risk of carcinogenesis. Therefore, there are radiations shielding parts in CT rooms and on CT scanners such as tungsten alloy plates and tungsten alloy tubes.

Tungsten alloy shield will be more and more popular in a medical CT room. You know, CT device is a common medical equipment that mainly uses X-rays for image diagnosis. For these X-rays, effective shielding protection is required to ensure the safety of professional operators and the patients and their family members. Therefore, each wall and protective door of the medical CT room are specially designed.

Tungsten alloy radiation protective door is a new type of radiation shielding door. Tungsten alloy door may be a manual side hung door, a manual sliding door, an electric sliding door, etc., which is mainly used in CT rooms, etc., to prevent the radiation of the CT device from leaking out, thereby protecting patients (receiving screening of novel coronavirus pneumonia) and their families, and medical personnel from hazard X ray radiation.

Tungsten alloy radiation shielding sheet is a lead-free shielding sheet that has excellent radiation shielding performance to X-rays and γ-rays, so it is mainly applied for CT room. Although walls of CT rooms have built with 37 solid bricks and the walls are coated with barium sulfate protective material (the ground and ceiling are also coated), the ceiling still needs to be protected by a lead plate of thickness of 3mm. Wherein, the lead equivalent depends on the parameters of CT device.

Tungsten alloy sheet applied for mobile CT scanner refers to a radiation shielding sheet placed behind the detector of the scanner for absorbing X-rays (not absorbed by the detector). Nowadays, the design of medical equipment is developing in the direction of miniaturization and convenience while taking the performance into account, and the same is true of CT equipment. In order to "offload" the mobile CT device, it is very important to choose a proper shielding material. Compared with traditional lead sheet, tungsten alloy sheet has higher density and stronger radiation protection performance, so it is more suitable as a radiation shielding sheet.

Tungsten alloy tube can be used as a radiation shield in a mobile CT scanner. The tube is a sleeve made of tungsten alloy plate, with thickness of 1-5 mm. The tungsten alloy shielding tube has a slit with the same width as the detector for X-ray photon emission to realize CT imaging.

Fine tungsten disulfide is a tungsten chemical product. Tungsten disulfide (WS2) is mainly used as a lubricant or as a petroleum catalyst. There are many preparation methods for fine particle size tungsten disulfide, including the ammonium tetrathiotungstate method, sulfur method, and the preparation method using WO3 and W powder as raw materials and introducing hydrogen sulfide gas or sulfur vapor. At present, the most commonly used method in industry is ammonium tetrathiotungstate method.