Related Experiment Video
Updated: Jun 13, 2026
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Experimental and Monte Carlo determination of the TG-43 dosimetric parameters for the model 9011 THINSeed
R M Kennedy1, S D Davis, J A Micka
1Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA. rmkennedy@wisc.edu
Purpose:
AAPM TG-43 brachytherapy dosimetry parameters for a new, smaller diameter 1251 brachytherapy source (THINSeed, model 9011) were determined using LiF:Mg,Ti thermoluminescent dosimeter (TLD-100) microcubes and Monte Carlo simulations.
Methods:
Two polymethyl methacrylate phantoms were machined to hold TLD-100 microcubes at specific locations for the experimental determination of the radial dose function, dose-rate constant, and anisotropy functions of the new source. The TG-43 parameters were also calculated using Monte Carlo simulations. For comparison, the model 6711 source was also investigated.
Results:
Experimental results for both models 9011 and 6711 sources showed good agreement with Monte Carlo values, as well as with previously published values.
Conclusions:
The TG-43 parameters for the new source model are similar to those of model 6711; however, they represent two separate sources and TG-43 parameters used in treatment planning must be source specific.
