Medical tungsten radiation shielding material is a class of radiation protective material that has high radiation shielding performance and environmental protection characteristics. There are two type of medical tungsten radiation shielding materials - tungsten alloy materials and tungsten polymer materials. And they are the first choice materials for manufacturing medical radiation shields for different applications.

The researchers proposed a preparation method of ammonium paratungstate, in which the obtained APT is high-purity APT. That is because: with the continuous development of the tungsten industry, the ammonium paratungstate products produced by the existing ion exchange method and extraction method are increasingly unable to meet the requirements of producing high-quality tungsten deep processing products.

Tungsten alloy sheet is applied for a CT detector (X-ray detector) to shield X-ray radiation. Tungsten alloy sheet is made of W-Ni-Fe alloy - an alloy composed of a small amount of nickel, iron and other alloying elements using tungsten as the matrix, and has a high density (~18.8g/cm3) and a high energy ray absorption capacity (1/3 higher radiation absorption coefficient than lead), so that it is widely used in the radiation protection and guidance of CT detectors to provide radiation protection for medical workers, patients and their family members.

How to prepare ammonium paratungstate? At present, ion exchange method and extraction method are mainly used to produce ammonium paratungstate (APT) by domestic manufacturers.