Dosimeter used for detecting rays of medical electron linear accelerator

Abstract

The invention discloses a dosimeter used for detecting rays of a medical electron linear accelerator. The dosimeter is characterized by comprising a plane-parallel ionization chamber used for generating current signals according to the intensity of the rays; a current preamplifier used for amplifying the current signals output by the ionization chamber and converting the amplified current signals into voltage signals; a filter integral circuit used for widening and filtering the voltage signals; a gain amplification circuit used for amplifying the widened and filtered voltage signals to a certain degree; an analog-to-digital converter used for converting the voltage signals amplified by the gain amplification circuit into digital signals; and a single-chip controller used for receiving the digital signals output by the analog-to-digital converter and obtaining dosage values and measurement errors according to the intensity of the digital signals. The dosimeter can simultaneously measure multiple parameters, is high in measuring stability, is high in linearity, and is easy and efficient to operate.

Description

technical field [0001] The invention belongs to the field of medical technology, and relates to an auxiliary device of a linear accelerator, in particular to a dosimeter for detecting radiation of a medical electron linear accelerator. Background technique [0002] With the continuous development of radiotherapy technology, the effectiveness of radiotherapy in tumor treatment has become an indispensable treatment method in modern medical examination. There are three main types of radiation sources used in radiotherapy: α, β, and γ rays produced by radioisotopes; X-rays of different energies produced by X-ray therapy machines and various accelerators; electron beams, proton beams, and neutrons produced by various accelerators. beams, negative π mesons, and other heavy ion beams. [0003] The medical electron linear accelerator is a particle accelerator device that generates high-energy X-rays and electron beams for radiotherapy of tumors. It is widely used because of its wid...

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Problems solved by technology

[0005] During the morning inspection of the medical electron linear accelerator, it is necessary to measure its temperature, air pressure, dose value, measurement error, beam emission time and other parameters. However, the dosimeter in the prior art can only measure the medical electron linear accelerator. For a single parameter of the accelerator, if it is necessary to measure multiple parameters of the medical electron linear accelerator, the measurement procedure is complicated, involving many measurement equipment, and the measurement operation is cumbersome, which is not conducive to rapid on-site detection, and the use of wired data transmission is inconvenient for measurement. Disadvantages such as obtaining measurement results in a timely manner

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