Air kerma strength characterization of a GZP6 Cobalt-60 brachytherapy source
Abstract
Background
Task group number 40 (TG-40) of the American Association of Physicists in Medicine (AAPM) has recommended calibration of any brachytherapy source before its clinical use. GZP6 afterloading brachytherapy unit is a 60Co high dose rate (HDR) system recently being used in some of the Iranian radiotherapy centers.
Aim
In this study air kerma strength (AKS) of 60Co source number three of this unit was estimated by Monte Carlo simulation and in air measurements.
Materials and methods
Simulation was performed by employing the MCNP-4C Monte Carlo code. Self-absorption of the source core and its capsule were taken into account when calculating air kerma strength. In-air measurements were performed according to the multiple distance method; where a specially designed jig and a 0.6[[ce:hsp sp="0.25"/]]cm3 Farmer type ionization chamber were used for the measurements. Monte Carlo simulation, in air measurement and GZP6 treatment planning results were compared for primary air kerma strength (as for November 8th 2005).
Results
Monte Carlo calculated and in air measured air kerma strength were respectively equal to 17240.01[[ce:hsp sp="0.25"/]]μGym2[[ce:hsp sp="0.25"/]]h−1 and 16991.83[[ce:hsp sp="0.25"/]]μGym2[[ce:hsp sp="0.25"/]]h−1. The value provided by the GZP6 treatment planning system (TPS) was “15355[[ce:hsp sp="0.25"/]]μGym2[[ce:hsp sp="0.25"/]]h−1”.
Conclusion
The calculated and measured AKS values are in good agreement. Calculated-TPS and measured-TPS AKS values are also in agreement within the uncertainties related to our calculation, measurements and those certified by the GZP6 manufacturer. Considering the uncertainties, the TPS value for AKS is validated by our calculations and measurements, however, it is incorporated with a large uncertainty.
Keywords: GZP6 HDR systemAir kerma strengthMCNP 4C Monte Carlo codeIn air measurement