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Dose rate range simulation and expansion device

A technology of expansion device and dose rate, which is applied in the direction of radiation measurement and instruments, can solve the problem that the radiation field cannot meet the linearity inspection of the dosimeter, and achieve the effect of linear detection of the range

Pending Publication Date: 2018-01-12
SHANDONG MEASUREMENT SCI RES INST
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Problems solved by technology

[0004] The present invention aims to provide a dose rate range analog expansion device to solve the problem that the radiation field cannot satisfy the linearity test of the dosimeter

Method used

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  • Dose rate range simulation and expansion device

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Embodiment 1

[0013] as attached figure 1 As shown, this embodiment includes 5 graphite cavity ionization chambers, and the graphite cavity size of each graphite cavity ionization chamber is different. According to the order of graphite cavity from small to large, graphite cavity ionization chamber I1-1, graphite cavity ionization chamber I1-1, graphite cavity ionization chamber Cavity ionization chamber Ⅱ1-2, graphite cavity ionization chamber Ⅲ1-3, graphite cavity ionization chamber Ⅳ1-4 and graphite cavity ionization chamber Ⅴ1-5. Current generated by five graphite cavity ionization chambers under the same radiation field conditions The signal has a fixed ratio, and each graphite cavity ionization chamber is connected to the electrometer 2 of the dosimeter for linearity of the dose rate range of the dosimeter.

[0014] In this embodiment, ionization chambers with different sizes of graphite cavities are set to obtain electrical signals with fixed ratios under the same radiation field con...

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Abstract

The invention relates to a dose rate range simulation and expansion device. The dose rate range simulation and expansion device comprises more than two graphite cavity ionization chambers with graphite cavities in different size, accordingly when under the identical radiation conditions, electric signals / current generated by the graphite cavity ionization chambers can maintain a fixed ratio of a few or dozen times, and every graphite cavity ionization chamber is connected with the static monitor of a dosimeter for achieving dose rate range linearity of the dosimeter. By means of the graphite cavity ionization chambers with the graphite cavities in different size, the dose rate range simulation and expansion device can acquire the electric signals of the fixed ratio to simulate and expand dose rate and further to achieve dose rate range linear detection of the dosimeter.

Description

technical field [0001] The invention relates to the technical field of dosimeter verification, in particular to a dose rate range simulation expansion device. Background technique [0002] The calibration of the dosimeter needs to check the linearity of the dose rate range, that is, under the radiation field conditions of the dose rate 0.1Gy / min, 1.0Gy / min, 2.0Gy / min, 3.0Gy / min and 5.0Gy / min, the dosimeter electrical Partial linearity is tested, but the radiation field dose rate in some verification places is only 0.1Gy / min, which cannot meet the measurement requirements. [0003] The dosimeter used in radiotherapy is composed of two parts: an ionization chamber and an electrometer. The ionization chamber is a radiation collection device that converts radiation (X-ray) collection into electrical signals. The collection area of ​​the ionization chamber (graphite cavity ionization chamber) is graphite The larger the cavity, the larger the electrical signal collected and conve...

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Application Information

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IPC IPC(8): G01T7/00
CPCY02E30/30
Inventor 刘洋侯铁栋孙静樊超秦霄雯张强
Owner SHANDONG MEASUREMENT SCI RES INST