Target assembly and linear accelerator including the target assembly

Abstract

The invention discloses a target assembly, which includes: a base, a target and a cover. Wherein, a target is mounted on the base in contact with oxygen for generating X-rays under the impact of electrons from an accelerating tube. A shield made of an electron-transparent material is arranged between the target and the output window of the accelerating tube for preventing oxides of the target from contaminating the output window of the accelerating tube. According to the target assembly of the present invention, the output window of the target and the accelerating tube can be blocked by the cover. Therefore, during operation, even if the target is oxidized to generate molten oxides and is sputtered, these oxides will also accumulate on the cover. , so as to avoid the pollution of the output window of the accelerating tube.

Description

technical field [0001] The invention relates to a target assembly, in particular to a target assembly of a linear accelerator of radiotherapy equipment. Background technique [0002] Radiation therapy is a common method of cancer treatment. It uses X-rays to irradiate cancer tissues to kill cancer cells and achieve the purpose of treatment. [0003] The above-mentioned radiation therapy usually uses a medical electron linear accelerator, which includes an accelerating tube and a treatment head. The working principle of the accelerating tube is to accelerate electrons from the electron gun under the action of a microwave electric field, and the electron beam hits the target in the target assembly to generate X-rays, used to treat patients. [0004] Usually, the target assembly is arranged outside the accelerating tube and exposed to the air, and the material of the target is generally tungsten. In this way, if the dose rate is high during work, the temperature of the target...

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Problems solved by technology

In this way, if the dose rate is high during work, the temperature of the target rises rapidly and is oxidized by the oxygen in the air to form tungsten oxide, and the tungsten oxide melts at 1100-1250 degrees Celsius. At this time, the electrons from the accelerating tube The impact energy of the beam will cause the tungsten oxide in the molten state to splash around, and the splashed tungsten oxide may be directly sputtered onto the output window of the accelerating tube facing the target substrate. Over time, the accumulated tungsten oxide on the output window of the accelerating tube will be As a result, its thermal conductivity is greatly reduced, resulting in damage

As everyone knows, periodically changing the output window of the accelerating tube is annoying work, and the breakage of the output window of the accelerating tube usually means the breakage of the whole accelerating tube, that is, it is likely to need to replace the whole accelerating tube, which is very important for the user. very expensive

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