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

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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 scan

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

Examples

Experimental program
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Effect test

Example Embodiment

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

[0043] (1) The response of a large-area parallel-plate ionization chamber to a single-energy pencil beam with an energy of 250 MeV / u was measured by using the Bragg Peak Chamber34070 produced by PTW Company (the sensitive volume diameter of the detector is 8.4 cm);

[0044] During measurement, set a fixed set of counts MU (1×10 4 , 2×10 4 , 3×10 4 , 4×10 4 ), the readings in the dosimeter when the single-energy pencil beam acts on the large-area parallel-plate ionization chamber in turn are 8.86, 18.86, 28.86, and 38.86, respectively, which are recorded as the central reading D spot ; 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 field w...

Example Embodiment

[0057] Example 2: see figure 1 , the center reading D spot with central dose D center The establishment of the mapping relationship between them is achieved 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 micro-sensitive volume ionization chamber 5 to the dose calibration field 7 to establish a standard relational database. .

Example Embodiment

[0058] Example 3: see figure 2 , the large-area parallel plate ionization chamber 4 measures the single-energy pencil beam 1 device including a scanning magnet 2 arranged downstream of the single-energy ion pencil beam 1 to control and ensure the single-energy ion pencil beam 1 along the beam transport line For collimation distribution, an online monitoring detector 3 is arranged on the beam axis 6 , and a large-area parallel plate ionization chamber 4 is arranged at the end of the beam axis 6 . It is required to ensure that the beam is vertically irradiated to the large-area parallel plate ionization chamber 4 after passing through the online monitoring detector 3 along the beam axis 6 .

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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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