Izvestiya of Saratov University.

Physics

ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)

For citation:

Belousov A. V., Belianov A. A., Chernyaev A. P. Calculation and Approximation of Radial Dose Function of Iridium Sources. Izvestiya of Saratov University. Physics , 2016, vol. 16, iss. 4, pp. 203-211. DOI: 10.18500/1817-3020-2016-16-4-203-211

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Physics of atomic nucleus and elementary particles
UDC: 
53.06
DOI: 
10.18500/1817-3020-2016-16-4-203-211

Calculation and Approximation of Radial Dose Function of Iridium Sources

Autors: 
Belousov Alexandr Vital'evich, Lomonosov Moscow State University
Belianov Aleksandr Aleksandrovich, Lomonosov Moscow State University
Chernyaev Alexandr Petrovich, Lomonosov Moscow State University
Abstract: 

Background and Objectives: The purpose of this paper is to investigate optimal fitting parameters for approximating radial dose function of Iridium sources. Calculations were performed using written by authors source code based on GEANT4 library package designed to simulate particle transport processes using Monte–Carlo method. Results: Following parameters of the source were determined: dose rate constant, radial dose function and anisotropy function. Obtained satisfactory coherence with other researchers’ data. The data obtained using developed and verified code could be used in treatment planning system (TPS). In addition, this paper presents improved functional form for fitting radial dose function (RDF) brachytherapy sealed sources with Ir-192. Suggested functions allow for fitting RDF precisely in a range of 0,5–20 cm. Maximum deviations between fit data and Monte–Carlo simulation data don’t exceed 0,6%, while average deviation is around 0,1%. Fitting coefficients for suggested functions are presented for 11 sources from different manufacturers. Conclusion: Suggested functions are suitable for using in TPS to calculate radial dose distributions around sources more precisely, using broad range of data using TG-43 protocol.

Key words: 
brachytherapy sources
metod Monte–Carlo
method GEANT4
TG-43
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