The researchers proposed a new two step ion exchange method for the preparation of high purity ammonium paratungstate. This method overcomes the shortcomings of low tungsten adsorption capacity, low concentration of crude sodium tungstate feed liquid, and large dilution of feed liquid in the ion exchange process using strong basic anion exchange resin, while maintaining certain advantages.

The researchers proposed a preparation method of APT (ammonium paratungstate). The method is simple and easy to operate. The yield of APT is high. The obtained APT has high purity. And the energy consumption is extremely low.

Thermal decomposition process of APT is the thermal decomposition process of ammonium paratungstate. The researchers have proposed a detailed and systematic decomposition mechanism of ammonium paratungstate under inert gas on the basis of summarizing previous research results.

It is a new process to obtain tungsten trioxide by microwave heating ammonium paratungstate. The process requires a short calcination time (only 4min, while the traditional method takes about 2h), and the prepared yellow WO3 powder product is of good quality so that it is worth applying in industry.

The researchers proposed a method for preparing tungsten trioxide by using wet ammonium paratungstate as raw material.

Thermal decomposition process of ammonium paratungstate has attracted much attention of researchers as it is an important raw material for preparing tungsten oxide (by calcining APT), and tungsten oxide is an important raw material for preparing tungsten powder by hydrogen reduction, and tungsten powder is an important raw material for preparing tungsten electrode by powder metallurgy.

How to prepare high purity ammonium paratungstate? The researchers proposed an economical method for preparing high purity ammonium paratungstate with high yield and simple process.

Tungsten heavy alloy shield is made with high tungsten content and low amounts of Ni, Fe or Ni, Cu. Some tungsten alloy shields are added Co, Mo or Cr, etc. The density of tungsten heavy alloy could be as high as 16.8-18.8g/cm3.

Tungsten alloy syringe shield with lead glass window is thin, lightweight and easy to use. Such a high quality syringe is designed to attenuate FDG F-18 or Tc-99, thereby reducing hand exposure for clinicians during preparation and administration of radiopharmaceuticals. It fits most disposable syringes. And it is easily sanitized with alcohol wipes.

Tungsten alloy collimator is a key component that affects the imaging quality of gamma camera (γ camera). Tungsten alloy collimator on a gamma camera is to realize spatial positioning, so that rays from different spatial parts irradiate a specific position of the scintillator. Studies have shown that under the principle of taking into account both geometric resolution (or angular resolution) and detection sensitivity, reducing the transmission effect as much as possible is the core goal of γ camera collimator design.