Evaluation of TG-43U1 in miniature X-ray tubes used in electronic brachytherapy through Monte Carlo simulation

[摘要] Abstract Background and purpose: The first formulation of AAPMTG-43 was presented for the sources with apparent activities in 1995. in 2004, the converted formulation was used to calculate the dose of Nucleoid brachytherapy sources. Subsequently, the formulation for miniature x-ray tubes called TG-43U1 protocol was exploited along with two requirements: normalizing the air-kerma strength and the active length of miniature x-ray tubes limiting to zero. On the basis of the geological structure of miniature x-ray tubes and the capabilities of the monte carlo code, it has been required that TG-43U1 protocol for miniature x-ray tubes is evaluated using this code. method: the quantities sk ، Λ ، g(r) and F (r, θ) for energies 40, 45, and 50 kilo electron volt are evaluated through simulation of hemispherical and hemispherical-conical tubes and MCNPX (2.6.0) code. Findings: after running the monte carlo code, the numerical values of air-kerma strength, Dose rate constant, Radial dose function and anisotropy dose function are presented in the form of tables and figures. Conclusion: a nice agreement is reached among the results of hemispherical miniature x-ray tubes and the applicable tubes in AXXent system along with hemispherical-conical miniature x-ray tubes and the one used in Intrabeam system with application of TG-43U1 protocol.

[学科分类] 基础医学

[关键词] miniature x-ray tube;electronic brachytherapy;TG-43U1;montecarlo code