Radioactive source inversion method based on multi-algorithm

A radioactive source and multi-algorithm technology, applied in X-ray energy spectrum distribution measurement, dosimeter, etc., can solve problems such as single method and inability to guarantee the correctness of radioactive source information

Inactive Publication Date: 2012-07-18
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
Comparison scheme
Effect test

example 1

[0046] Example 1: Take the 20MeV electron source output from the Varian2100 radiation source (electron accelerator) as an example.

[0047] 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 through the Monte Carlo program EGSnrc, which is publicly used internationally, by simulating the energy deposition of a unidirectional vertical incident radiation in a 10cm×10cm field , The energy interval is from 0 to 60MeV, the energy interval is 0.25MeV;

[0048] Use three-dimensional water tank measurement to obtain measured 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 radioactive source's nose and frame to 0 degrees, place the water tank on a horizontal ground, and the line between the center of the water tank and the center of the nose is perpendicular to the horizontal ground. The fi...

example 2

[0072] Take the 6MV photon source output from the Varian2100 radiation source (the photon beam generated by the electron accelerator targeting) as an example.

[0073] In the first step, on the basis of example 1, put image 3 The parallel source is changed to a point source of photon incidence, the measured PDD curve input by the user is Figure 5 , Other model parameters remain unchanged. Steps 2 to 4 are consistent with the steps of Example 1. The output photon energy spectrum results are shown in Image 6 Among them, the C1 / C2 / C3 / C6 algorithm results are better, and the C1 algorithm results are the best results.

[0074] Production principle: Users use three-dimensional water tank measurement to obtain PDD. Use automatic water tanks or other media to measure the PDD curve of radioactive sources: adjust the angle of the radioactive source head and frame to 0 degrees, place the water tank or other media on a horizontal ground, and the center point of the measuring device 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 methodhas 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 theaccurate 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 canbe 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 inversion and reconstruction methods for radioactive sources. Background technique [0002] The source information that can be inverted using the dose information measured in vitro is the source inversion. The source inversion method ensures that the correct radioactive source information is obtained-including electronic energy spectrum, proton energy spectrum, photon energy spectrum, photon pollution and other information, which provides an important guarantee for accurately understanding the 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 Monte Carlo simulation source, but it needs to establish ...

Claims

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Application Information

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Patent Type & Authority Patents(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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