Casal E, Ballester F, Lluch J L, Pérez-Calatayud J, Lliso F
Centro Nacional de Dosimetria, Valencia, Spain.
Med Phys. 2000 Jan;27(1):132-40. doi: 10.1118/1.598875.
The Amersham CDCS-M-type 137Cs stainless-steel encapsulated source is widely used in low dose rate brachytherapy with manual afterloading. However there is a need for more accurate dosimetry data. In this study we present Monte Carlo calculations of absolute dose rate in water around this source using the Monte Carlo code GEANT, discuss dosimetric features of these data, and compare them with Krishnaswamy's results for 137Cs intracavitary sources. Dose rate distributions are presented in the form of along-away tables and in the TG43 formalism. Simulated absolute dose rate values can be used as benchmark data to verify the treatment planning system calculation results or directly as input data for treatment planning. Best-fit values of attenuation coefficients suitable for use in Sievert integral type calculations have been derived comparing dose rate distributions calculated using this algorithm with those obtained from Monte Carlo calculations.
阿美仙CDCS - M型137铯不锈钢封装源广泛应用于手动后装的低剂量率近距离放射治疗。然而，需要更精确的剂量测定数据。在本研究中，我们使用蒙特卡罗代码GEANT给出了该源周围水中绝对剂量率的蒙特卡罗计算结果，讨论了这些数据的剂量学特征，并将其与克里希纳斯瓦米关于137铯腔内源的结果进行比较。剂量率分布以沿 - 离表格形式和TG43形式给出。模拟的绝对剂量率值可作为基准数据，用于验证治疗计划系统的计算结果，或直接作为治疗计划的输入数据。通过将使用该算法计算的剂量率分布与蒙特卡罗计算获得的分布进行比较，得出了适用于西弗积分类型计算的衰减系数的最佳拟合值。
