Experimental and Monte Carlo determination of the TG-43 dosimetric parameters for the model 9011 THINSeed brachytherapy source.
OBJECTIVE
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.
Kennedy
R M
RM
Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA. rmkennedy@wisc.edu
Davis
S D
SD
Micka
J A
JA
DeWerd
L A
LA
D016880:Anisotropy; D001185:Artificial Intelligence; D001918:Brachytherapy / Q000295:instrumentation* / Q000379:methods*; D002138:Calibration; D006801:Humans; D007457:Iodine Radioisotopes / Q000494:pharmacology; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods; D012984:Software; D013819:Thermoluminescent Dosimetry / Q000379:methods
D007457:Iodine Radioisotopes; D019904:Polymethyl Methacrylate