Wide-energy Atmospheric Air Ionization Chamber for Medical Accelerator

Abstract

The invention discloses a wide-energy normal-pressure air ionization chamber for a medical accelerator, and relates to an ionization radiation detection technology. The chamber includes a shell made of metal materials; an inner container arranged in the shell and forming an air layer between the inner container and the inner wall of the shell, and made of metal materials; a collector arranged in the inner container, and having the bottom penetrating through the inner container; an insulating gasket wrapped outside the collector and arranged between the inner container and the collector. An electronic system used for signal transmission and electrically connected with the collector is arranged in the base. The wide-energy normal-pressure air ionization chamber for the medical accelerator issimple in structure, convenient to install and use, and maintain.

Description

technical field [0001] The invention relates to ionizing radiation detection technology, in particular to a wide-energy normal-pressure air ionization chamber used for medical accelerators. Background technique [0002] Proton therapy is currently one of the most effective cancer treatment methods in the world, and my country has gradually begun to develop it. Our company is independently developing a superconducting cyclotron with an energy of 230MeV for proton therapy. During the beam supply and transportation process of the accelerator, neutron and photon radiation will inevitably be generated. Therefore, the beam loss monitoring system is of great significance for protecting the safety of personnel and equipment, and providing verification data for theoretical design. It is indispensable for large-scale accelerator facilities. Important subsystems that are missing. In addition, with the maturity of proton therapy technology, its commercialization and industrialization ...

AI Technical Summary

Problems solved by technology

[0004] Beam loss detectors basically adopt the scheme of air ionization chamber, PIN diode and scintillator. Considering the condition of high-power beam supply, the life of PIN diode and scintillator is greatly shortened due to radiation damage. Relatively The ionization chamber is the most reliable detector. From the analysis of the working medium type and structure, the high-pressure nitrogen ionization chamber of SNS has good electrical performance, but the manufacturing and maintenance process is troublesome, and the ionization chamber cannot continue to work in case of leakage; Due to its relatively large volume, the chamber has certain requirements for installation space, and proton therapy equipment is generally built in hospitals with limited space, so it is not suitable for proton therapy systems; the beam damage detection of U-70 uses a combination of multiple small ionization chambers Mode, which puts forward high requirements on both design and manufacture, which greatly increases the cost

[0005] To sum up, the traditional ionization chamber is complex in design and requires high requirements in the manufacturing and installation process, which increases the production cost

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