Thomason C, Mackie T R, Lindstrom M J, Higgins P D
Department of Medical Physics, University of Wisconsin, Madison 53706.
Phys Med Biol. 1991 Apr;36(4):475-93. doi: 10.1088/0031-9155/36/4/006.
Dose distributions in water have been measured using LiF thermoluminescent dosimeters for 192Ir seed sources with stainless steel and with platinum encapsulation to determine the effect of differing encapsulation. The dose distribution has also been measured for a 137Cs seed source. In addition, dose distributions surrounding these sources have been calculated using the EGS4 Monte Carlo code and have been compared to the measured data. The two methods are in good agreement for all three sources. Tables are given which describe the dose distribution surrounding each source as a function of distance and angle. In addition, specific dose constants have been determined from results of Monte Carlo simulation. This work has confirmed the utility of the EGS4 Monte Carlo code in modelling 192Ir and 137Cs seed sources to obtain brachytherapy dose distributions.
使用LiF热释光剂量计测量了水中192Ir种子源在不锈钢封装和铂封装情况下的剂量分布，以确定不同封装的影响。还测量了137Cs种子源的剂量分布。此外，使用EGS4蒙特卡罗代码计算了这些源周围的剂量分布，并与测量数据进行了比较。对于所有三种源，这两种方法的结果吻合良好。给出了表格，描述了每个源周围剂量分布随距离和角度的变化情况。此外，根据蒙特卡罗模拟结果确定了特定剂量常数。这项工作证实了EGS4蒙特卡罗代码在模拟192Ir和137Cs种子源以获得近距离治疗剂量分布方面的实用性。
