Abstract： Objective To simulate and calculate the dosimetric parameters of the GZP 60Co source that has been clinically used in high-dose-rate brachytherapy. Methods The EGSnrc Monte Carlo software was used to simulate and calculate the dosimetric parameters of a well known BEBIG 60Co source (Co0.A86). The results were compared with the actual parameters to verify the feasibility of this method. A Monte Carlo model of the GZP 60Co source for high-dose-rate brachytherapy was established to simulate and calculate its dosimetric parameters in the same way. Results For the BEBIG 60Co source, the results were well accorded with the standard. The air-kerma strength per unit activity (SK/A) and dose rate constant(Λ) deviated from the standard by 0.2% and 1.0%, respectively. The curves of the radial dose function gL (r) and the anisotropy function F (r,θ)fit well. For the GZP 60Co source, the SK/AandΛvalues were calculated as 3.011×10-7 cGycm2h-1Bq-1 and 1.118 cGyh-1U-1 in channel 1&2 and 3.002×10-7 cGycm2h-1Bq-1 and 1.110 cGyh-1U-1 in channel 3. The gL (r), F (r,θ), and dose rate per unit air-kerma strength ina liquid water phantom were listed as the American Association of Physicists in Medicine recommended. Conclusions The results can be used in planning system and quality control for the GZP 60Co source.
Wang Xianliang,Yuan Ke,Tang Bin et al. A Monte Carlo-based dosimetric study of the GZP 60Co source[J]. Chinese Journal of Radiation Oncology, 2016, 25(5): 489-495.
2016, Vol. 25 
