Weaver K A, Smith V, Huang D, Barnett C, Schell M C, Ling C
Department of Radiation Oncology, University of California, San Francisco 94143.
Med Phys. 1989 Jul-Aug;16(4):636-43. doi: 10.1118/1.596322.
As mandated by an NCI brachytherapy contract, we measured dosimetric parameters for 192Ir seeds and two models of 125I seeds. Measurements were with LiF powder in a water-equivalent phantom. Data were corrected for background, sample mass, and finite detector volume. Selected parameters were also investigated through Monte Carlo calculations. Results are presented in terms of a dose parametrization that is described in detail, and are compared to published data. Our results agreed well with published data for relative quantities such as radial and angular dose dependence. Our measured value for the 192Ir dose factor was 4.55 cGy(H2O) cm2 mCi-1 h-1, also in good agreement with commonly used values. However, the measured dose factors for 125I seed models 6702 and 6711 were 1.18 and 1.06 cGy(H2O) cm2 mCi-1 h-1, values well below those in general use.
根据美国国立癌症研究所（NCI）近距离放射治疗合同的要求，我们测量了192Ir种子和两种型号125I种子的剂量学参数。测量是在水等效体模中使用LiF粉末进行的。数据针对本底、样品质量和有限的探测器体积进行了校正。还通过蒙特卡罗计算研究了选定的参数。结果以详细描述的剂量参数化形式呈现，并与已发表的数据进行了比较。我们的结果与已发表的关于径向和角向剂量依赖性等相对量的数据吻合良好。我们测得的192Ir剂量因子值为4.55 cGy(H2O) cm2 mCi-1 h-1，也与常用值吻合良好。然而，6702和6711型号125I种子的测量剂量因子分别为1.18和1.06 cGy(H2O) cm2 mCi-1 h-1，远低于一般使用的值。
