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Monte Carlo characterization of a new Yb-169 high dose rate source for brachytherapy application
Mario J Cazeca1, David C Medich, John J Munro
1Department of Physics and Applied Physics, University of Massachusetts Lowell, 1 University Avenue, Lowell, Massachusetts 01854, USA. mariocazeca@yahoo.com
Purpose:
The objective was to characterize a new Yb-169 high dose rate source for brachytherapy application.
Methods:
Monte Carlo simulations were performed using the MCNP5 F6 energy deposition tallies placed around the Yb-169 source at different radial distances in both air-vacuum and water environments. The calculations were based on a spherical water phantom with a radius of 50 cm. The output from the simulations was converted into radial dose rate distribution in polar coordinates surrounding the brachytherapy source.
Results:
The results from Monte Carlo simulations were used to calculate the AAPM Task Group 43 dosimetric parameters: Anisotropy function, radial dose function, air kerma strength, and dose rate constant. The results indicate a dose rate constant of 1.12 +/- 0.04 cGy h(-1) U(-1), anisotropy function ranging from 0.44 to 1.00 for radial distances of 0.5-10 cm and polar angles of 0 degrees-180 degrees.
Conclusions:
The data from the Yb-169 HDR source, Model M42, presented in this study show that this source compares favorably with another source of Yb-169, Model 4140, already approved for brachytherapy treatment.
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