Tungsten Collimator

The tungsten collimator is a device for reducing the particle beam or light wave. In addition to the primary and secondary collimators, the electron beam limiter is equipped under the radiation head for the collimation of electron radiation. Its main function is to limit the range of electron radiation to protect normal tissues outside the target area and protect vital organs from irradiation. A good collimator can help reduce scattered radiation, resulting in better sensitivity sheets. 

Tungsten collimators are mainly used in linear accelerators and cyclotrons in the medical field. High-energy rays are used to perform radiotherapy on the tumor site of patients, and collimators play an important role in radiotherapy. They are used to adjust the direction of the particle or wave beam. The high-precision primary collimation system and secondary collimation system can reliably guide the ray beam to only pass through the set area, achieve the radiation field of view you designed, and ensure that 100% of the patient is secure.

A tungsten alloy collimator is a component of the radiation head of a medical accelerator. The component that produces a certain shape contour radiation field is called the collimation system, and the component that produces a regular shape contour radiation field is called the regular field collimation system. The regular field refers to the square rectangular or circular radiation field with variable size contour.

1) Under the condition of the same thickness, the ray shielding ability of tungsten alloy is more than 1.7 times that of lead. When the ray is stronger, the difference between the two ray shielding ability is more obvious;

2) Tungsten alloy material has environmental protection characteristics, while lead is poisonous, and the radiation detector made by tungsten alloy shielding parts is not harmful to human safety;

3) Tungsten alloy is easy to machine, and its density and hardness are higher than that of lead material. After sintering, the tungsten alloy shield can reach a very low thickness;

4) Tungsten has the highest melting point among metals, and tungsten alloy can be used as a radiation detection material in some high-temperature environments;

5) Tungsten alloy has high stability under various special gas conditions, such as chlorine, bromine, or other halogen gases used as quenching gas to maintain its stability.

Sintering has a decisive effect on the performance of the tungsten collimator. As a result of sintering, the powder particles bond to each other, increasing the strength of the sintered body and, in most cases, its density. In the process of sintering, pressing to undergo a series of physical and chemical changes, the beginning is the evaporation or volatilization of water or organic matter, adsorption gas exclusion, stress elimination, powder particle surface oxide reduction; It is followed by diffusion between atoms, adhesive flow and plastic flow, an increase of contact surface between particles, recrystallization, grain growth and so on.

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