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Cross calibration method used for online beam monitoring detector in three-dimensional spot scanning beam distribution

A calibration method and detector technology, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as large uncertainty and systematic errors, too many equipment and detectors, and cumbersome processes, and achieve accurate implementation, improvement and improvement. Distribution technology, the effect of improving work efficiency

Inactive Publication Date: 2013-10-16
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a cross-calibration method for on-line beam monitoring detectors in three-dimensional point scanning beam distribution, to solve the point scanning calibration procedure involving too many devices and detectors, the process is cumbersome and Time-consuming, uncertain and systematic error problems

Method used

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  • Cross calibration method used for online beam monitoring detector in three-dimensional spot scanning beam distribution
  • Cross calibration method used for online beam monitoring detector in three-dimensional spot scanning beam distribution
  • Cross calibration method used for online beam monitoring detector in three-dimensional spot scanning beam distribution

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Effect test

Embodiment 1

[0042] Example 1: see figure 1 , figure 2 with image 3 , a method for cross-calibrating online beam monitoring detectors in three-dimensional point scanning beam distribution, comprising the following steps:

[0043] (1) Measure the response of a large-area parallel-plate ionization chamber to a single-energy pencil beam with an energy of 250 MeV / u using the parallel-plate ionization chamber Bragg Peak Chamber 34070 produced by PTW (the detector’s sensitive volume diameter is 8.4cm);

[0044] When measuring, set a set of fixed count MU (1×10 4 , 2×10 4 , 3×10 4 , 4×10 4 ), the measured readings in the dosimeter were 8.86, 18.86, 28.86, 38.86 when the single-energy pencil beam acted on the large-area parallel-plate ionization chamber in sequence, and recorded as the central reading D spot ; for experimental setup, see figure 2 .

[0045] (2) According to the fixed counting MU set in step (1), scan point by point at the incident depth of 6.8mm to form a calibration fi...

Embodiment 2

[0057] Example 2: see figure 1 , the center reading D spot with center dose D center The establishment of the mapping relationship between them is realized by analyzing the response data of the large-area parallel-plate ionization chamber 4 to the ion pencil beam 1 and the response data of the miniature sensitive volume ionization chamber 5 to the dose calibration field 7 under consistent conditions to establish a standard relational database. .

Embodiment 3

[0058] Embodiment 3: see figure 2 , the described large-area parallel plate ionization chamber 4 measuring single-energy pencil beam 1 device includes a scanning magnet 2 located at the downstream of the single-energy pencil beam 1, to control and ensure that the single-energy pencil beam 1 moves along the beam flow line For collimated distribution, an online monitoring detector 3 is installed on the beam axis 6, and a large-area parallel plate ionization chamber 4 is installed at the end of the beam axis 6. It is required to ensure that the beam passes through the online monitoring detector 3 along the beam axis 6 and irradiates vertically to the large-area parallel plate ionization chamber 4 .

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Abstract

The invention belongs to a calibration method for a detector used for monitoring ion beam radiation. The cross calibration method used for the online beam monitoring detector in three-dimensional spot scanning beam distribution includes the following steps: (1) measuring response of a large-area parallel-plate ionization chamber to monoenergetic ion pen-shaped beams; (2) forming a calibration field with a diameter of 80 to 120 mm through spot scanning and measuring accumulated dose of a mini-size absolute dose ionization chamber in the center of the dose calibration field; (3) establishing a mapping relation between a central reading and a central dose; (4) calibrating practically. The cross calibration method used for the online beam monitoring detector in the three-dimensional spot scanning beam distribution provided by the invention has advantages that (1) frequency of using a complicated scanning system is reduced and experiment errors and uncertainty of dose calibration in the spot scanning beam distribution are reduced; (2) a complicated conventional method is replaced with the simple and quick method, so that online beam monitoring detector calibrating time is reduced and working efficiency is improved; (3) ion beam three-dimensional spot scanning beam distribution technology is improved and developed, so that convenience is made for adjusting and controlling exposure doses of different scanning spots in an exposure area for realizing three-dimensional intensity modulated irradiation.

Description

technical field [0001] The invention belongs to a method for calibrating and calibrating a detector for ion beam radiation monitoring. Background technique [0002] Ion beams (protons and heavy ions) have important applications in life sciences, such as ion beam breeding, ion beam radiation therapy, etc. The active variable energy of the synchrotron cooperates with the magnet scanning system to guide the ion beam to carry out three-dimensional point scanning beam distribution, and realize the three-dimensional point scanning irradiation on the target body. In the ion beam three-dimensional point scanning beam distribution mode, since the number of ions to be irradiated at each scanning point is measured and controlled by the on-line beam current monitoring detector, the accurate monitoring and control of the ion beam flux is the key to the successful implementation of the ion beam three-dimensional Point-scanning beam distribution is a key link, so it is necessary to calibr...

Claims

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Application Information

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IPC IPC(8): G01T1/29
Inventor 戴中颖李强刘新国贺鹏博黄齐艳申国盛
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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