Device for improving measurement signal-to-noise ratio of alanine dosimeter

Abstract

The embodiment of the invention relates to a device for improving the measurement signal-to-noise ratio of an alanine dosimeter, which comprises a resonant cavity, an outer quartz tube, an inner quartz tube, a vacuum valve, a small vacuum pump, an alanine dosimeter and a rotating table, wherein the outer quartz tube is a cylindrical tube, comprises a bottom surface and a side wall and is arrangedin the opening of the resonant cavity in a penetrating mode; the inner quartz tube is a cylindrical tube and is arranged in the outer quartz tube, and the bottom end of the inner quartz tube is fixedly connected with the bottom surface of the outer quartz tube; the alanine dosimeter is a cylinder and is arranged at the top end of the inner quartz tube; the diameter of the alanine dosimeter is larger than the outer diameter of the inner quartz tube and smaller than the inner diameter of the outer quartz tube; a rotating hole is arranged in the rotating table; the inner diameter of the rotatinghole is matched with the outer diameter of the outer quartz tube; the outer quartz tube is sleeved in the rotating table through the rotating hole, the outer quartz tube is driven to rotate by rotating of the rotating table, the measurement angle of the alanine dosimeter changes along with rotation, and resonance spectrum measurement is carried out on the alanine dosimeter at different angles; andthe vacuum pump is used to keep the inner part of a measured sample tube to be vacuum relatively, and influences on the measurement by oxygen are reduced.

Description

technical field [0001] The invention relates to the field of measuring absorbed dose of radiation treatment level, in particular to a device for improving the signal-to-noise ratio of alanine dosimeter measurement. Background technique [0002] The measurement of absorbed dose at radiation therapy level is an important development direction of the alanine / electron paramagnetic resonance spectroscopy dosimetry system in recent years. Compared with the most widely used ionization chamber and the thermoluminescent dosimeter as a transfer dosimeter, the alanine dosimeter has some superior dosimetric properties, mainly as follows: (1) alanine Biological tissue equivalence is good (because alanine is a kind of amino acid, and amino acid is an important component of protein), its radiation effect is closer to the radiation effect of living tissue, and the obtained dose can be given to the patient without conversion. The size of the dose received. (2) The free radicals formed in a...

AI Technical Summary

Problems solved by technology

[0004] However, during the measurement process of the alanine dosimeter, the position of the dosimeter in the resonant cavity of the electron paramagnetic resonance spectrometer will seriously affect the measurement results

Because a small change in the position of the dosimeter in the resonant cavity will cause a change in the magnetic field strength acting on the dosimeter itself, resulting in a change in the resonance frequency and affecting the final measurement result

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