Tungsten heavy alloy collimator, an important part of detector of SPECT system, is a collimator made of high density tungsten-based alloy with composition of W-Ni-Fe, W-Ni-Cu or W-Ni-Cu-Fe. There are a certain number of holes arranged on the collimator. According to the form of the drilled hole, the tungsten heavy alloy collimator is divided into tungsten alloy parallel-hole collimator, tungsten alloy focusing collimator, tungsten alloy converging collimator, and tungsten alloy pinhole collimator.

Lead shield is a thing of past. Tungsten alloy X-ray shield, a newly developed poison-free shielding partition, is the future in hospitals or dental clinics, which can fully protect the medical workers and patients from different radiation resources such as X-rays. It has been reported that tungsten alloy X-ray shield is safe as it is non-toxic, fire-resistant and anti-corrosion with premium stability. Also, it features excellent sound insulation properties. And it can create an excellent and robust surface.

Compared with lead, tungsten alloy has higher density and better radiation shielding performance, so it is often used as a radiation protective material in medical electron linear accelerator. In addition, taking the factors of environmental protection, tungsten alloy shields are more and more popular and are gradually replacing lead shields in the field of radiation shielding.

It has been reported that the linear accelerator can emit high energy X-rays or electrons to conform to a tumor's shape and destroy cancer cells while sparing surrounding normal tissue. So, tungsten alloy, as a radiation shielding material, is often used to medical linear accelerators to shield the high-energy X-rays generated by the accelerator during clinical radiotherapy treatment.

Tungsten alloy shielding is an advanced radiation protective material with better performance than the traditional lead shielding, so it is promising in applications in radiotherapy treatment room. It has been reported that tungsten alloy is an environmentally friendly material, which is non-toxic and non-polluting. While lead is a toxic heavy metal that will do harm human body and pollute the environment. In addition, tungsten alloy has higher strength and better processing performance than lead.

Tungsten alloy shielding door has many unique excellent properties, such as high density, high strength, good radiation absorption performance, corrosion resistance, easy cutting processing, and environmental protection, etc., so it is suitable for applying to medical electron linear accelerator room to shield the X-rays and neutron rays, which are generated when the accelerator is working.

Tungsten alloy radiation shield is more suitable for shielding X-rays and neutrons generated from the electron linear accelerator than lead radiation shield as tungsten alloy has high density of 16.5-18.75 g/cm3, which is 50% higher than lead. Also, tungsten alloy also has a strong ability to absorb rays, which is 30-40% higher than lead. In addition, tungsten alloy has environmental protection characteristics.

Tungsten alloy shielding part is more suitable for application of medical linear accelerator than lead shielding part to shield X-rays and neutron rays generated during the operation of the accelerator. That is because tungsten alloy is a new type of radiation shielding material with high density and high ray shielding performance. The density of tungsten alloy is 1.5 times that of lead. Also, tungsten alloy is environmentally friendly and pollution-free. While lead does harms to human body and pollutes the environment as it is toxic.

Yellow tungsten oxide nanocomposite film may be a nanocomposite film of polyainline (PANI) and tungsten trioxide (WO3), which may be fabricated by electropolymerization of aniline monomers onto WO3 coated ITO glass slides through spin coating technique and followed by annealing at 500 °C for 2h.

Yellow tungsten oxide nanowires have excellent gas sensitivity so that they are often used to prepare gas sensor. According to the experts, yellow tungsten oxide nanowires and silicon nanowires can be combined to obtain silicon nanowires - tungsten oxide nanowires composite structure, whose interface forms a homogeneous heterojunction. In NO2 gas, the increase of the width of the depletion layer in the heterojunction has an important effect on the improvement of its gas sensing performance.