SU-E-T-482: A More Accurate Bare (12) 5I Spectrum

Medical Physics
M Rodriguez, D Rogers

Abstract

To compare measured energy spectra of (125) I brachytherapy seeds with Monte Carlo calculated energy spectra when using the bare (125) I energy spectrum recommended by TG43 and the one presented in NCRP Report 58 and to determine the impact of these different spectra on the calculation of the dose rate constant. The energy spectrum, absorbed dose at 1 cm on the bisector and air kerma strength of 10 different (125) I seeds were calculated using the EGSnrc BrachyDose Monte Carlo code. Energy bin width was 0.2 keV. The simulations were done with the bare (125) I energy spectrum recommended by TG43 or NCRP Report 58. Statistical uncertainties for the energy spectra were 0.02% and 0.1% or less for the other clinical parameters. Results are compared with published measuredvalues. There is close agreement between the measured and calculated branching ratio generated by (125) I seeds when simulated using the spectrum presented in NCRP58. However, for all seeds a 7% lower value is observed in the 31 keV peak when using data suggested by TG43. On the other hand, differences in the average energy, air kerma, absorbed dose and dose rate constant are undetectable (less than statistical uncertainty, <0.1%) when performed with either spectrum...Continue Reading

Citations

Jun 22, 2012·PloS One·Sebastián ZamoranoClaudio Hetz

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