Tungsten alloy leaf is an important component on the multi-leaf collimator, and is also the main part of an IMRT device, which can achieve conformal irradiation, thereby minimizing the leakage of radiation dose. There are at least 20 pairs of tungsten alloy leaves on the multi-leaf collimator. Wherein, IMRT is also known as intensity modulated radiation therapy.

Tungsten alloy shielding device plays an important role in shielding X-rays and γ-rays in a CT scanner. Some researchers have proposed such a new shielding device, which has a simple structure and excellent X-ray radiation shielding performance. The existing shielding devices are difficult to move. While this new device is easy to move during use.

Tungsten alloy X ray shielding door is a new type of protective door, which is expected to be used to replace the original lead door, for applications in CT rooms, operating rooms, etc. Wherein, CT room has become one of the hotspots in recent months due to the novel coronavirus pneumonia epidemic as one of the screening items of COVID-2019 is CT chest. It has been reported that there are certain biological effects if X-rays are penetrating the human body. And if the amount of X-ray exposure exceeds the allowable exposure, radiation reaction may occur, and even a certain degree of radiation damage may occur.

The researchers used tungsten-containing waste to prepare ammonium paratungstate (APT) by leaching, extraction and ammonium sodium double salt method. Therefore, tungsten is effectively recovered. The quality of the prepared APT is higher. And it can further prepare tungsten oxide from APT. This method reduces the process cost by effectively recycling the salt-containing waste liquid generated in the process, which is worthy of vigorous promotion.