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Radioactive source inversion method based on multi-algorithm

A radioactive source, multi-algorithm technology, applied in X-ray energy spectrum distribution measurement, dosimeter and other directions, can solve the problem of single method and cannot guarantee the correctness of radioactive source information.

Inactive Publication Date: 2009-07-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method ignores photon pollution, and the method is single, which cannot guarantee the correctness of the obtained radioactive source information

Method used

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  • Radioactive source inversion method based on multi-algorithm
  • Radioactive source inversion method based on multi-algorithm
  • Radioactive source inversion method based on multi-algorithm

Examples

Experimental program
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Effect test

example 1

[0045] Example 1: Take the 20MeV electron source output by the Varian2100 radiation source (electron accelerator) as an example.

[0046] The first step is to obtain the single-energy depth dose curve PPD as a single-energy PPD database; the single-energy depth dose curve is obtained by simulating the energy deposition of a unidirectional vertically incident ray in a 10cm x 10cm field through the internationally publicly available Monte Carlo program EGSnrc , the energy interval is from 0 to 60MeV, and the energy interval is 0.25MeV;

[0047] Use the 3D water tank measurement to obtain the measurement PDD, such as figure 2 for the measurement model. Use the automatic water tank to measure the PDD curve of the Varian accelerator: adjust the angle of the head and frame of the radioactive source to 0 degrees, place the water tank on the horizontal ground, and the line connecting the center point of the water tank and the center point of the machine head is perpendicular to the ...

example 2

[0071] Take the 6MV photon source output by Varian2100 radiation source (photon beam generated by electron accelerator shooting) as an example.

[0072] The first step, on the basis of Example 1, put image 3 The parallel source is changed to a photon point source incident, and the measured PDD curve input by the user is shown in Figure 5 , and other model parameters remain unchanged. The second step to the fourth step are consistent with the steps of Example 1. The output photon spectrum results are shown in Image 6 , among which the results of the C1 / C2 / C3 / C6 algorithm are better, and the result of the C1 algorithm is the optimal result.

[0073] Production principle: The user obtains the PDD by three-dimensional water tank measurement. Use an automatic water tank or other medium to measure the PDD curve of the radioactive source: adjust the angle of the radioactive source head and the frame to 0 degrees, place the water tank or other medium on the level ground, and th...

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Abstract

The invention discloses a method for inversing a radiation source, which is to measure a PDD curve by a water tank or other radiation dosimetry measuring equipment. Information of the high accuracy radiation source can be acquired by the method, including photon energy spectrum, or proton energy spectrum, or electron energy spectrum and photon pollution and other radiation information. The method has the advantages that: the information of the photon energy spectrum, the electron energy spectrum, the proton energy spectrum, photon pollution and other radiation source information of the radiation source can be simultaneously reestablished; the defect that the prior energy spectrum calculation method can not accurately acquire multiple radiation source information can be overcome; while the accurate energy spectrum of the radiation source is accurately acquired, the information of the photon pollution and other information can be acquired; correct information of the radiation source can be provided for dose calculation; information of scattered or continuous energy spectrum and the photon pollution can be acquired; and the accurate radiation source can be realized by a plurality of algorithms so as to solve the problem that the prior single algorithm can not ensure that the inverse of the energy spectrum has a solution.

Description

technical field [0001] The invention belongs to the field of radioactive source inversion and reconstruction methods. Background technique [0002] Source inversion is the source information that can be deduced from the dose information measured in vitro. The source inversion method guarantees to obtain correct radioactive source information—including electron energy spectrum, proton energy spectrum, photon energy spectrum, photon pollution and other information, which provides an important guarantee for accurately understanding the ray composition of radioactive sources. [0003] Accurate radioactive source information is an important parameter to improve the accuracy of radiation dose calculation. Whether it is Monte Carlo simulation or analytical dose calculation, radioactive source information plays an important role. At present, there are three main ways to obtain radioactive source information, one is to simulate the source by Monte Carlo, but it needs to establish an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/36G01T1/02
Inventor 李贵郑华庆兰海洋孟耀宋钢吴宜灿
Owner UNIV OF SCI & TECH OF CHINA
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