A method for determination of parameters of the initial electron beam hitting the target in linac

Detailed characteristics of the electron beam incident on the target of the Linac are almost impossible to be measured. With Monte Carlo technique it is possible to simulate the transport of radiation through the accelerator head and find out the initial beam parameters. These parameters, such as en...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-05, Vol.851 (1), p.12032
Main Authors: Tai, D T, Son, N D, Loan, T T H, Tuan, H D
Format: Article
Language:English
Subjects:
Acceptance criteria
Dosage
Electron beams
Energy distribution
Energy spectra
Parameters
Photon beams
Physics
Simulation
Spatial distribution
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Summary:Detailed characteristics of the electron beam incident on the target of the Linac are almost impossible to be measured. With Monte Carlo technique it is possible to simulate the transport of radiation through the accelerator head and find out the initial beam parameters. These parameters, such as energy spectrum and spatial distribution can be ascertained by matching the simulated dose distributions with the measured dose distributions using trial and error. In this work, a Monte Carlo modeling of the HPD Siemens Primus linear accelerator in 6 MV photon beams at Dong Nai general hospital was performed. The simulated Percent depth doses (PDD) and beam profiles (OCR) were then compared with the measured ones. Excellent agreements were obtained between simulations and measurements with an average difference of 0.7% for PDD less than 2% for OCR. The percentage gamma passing rate is 100% with 1% dose difference and 1 mm distance to agreement as acceptance criteria. The best suited energy and radius of the electron beam incident on the target were found at 6.04 MeV and at FWHM = 1.2 mm respectively.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/851/1/012032