Chiu-Tsao S T, Anderson L L
Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York 10021.
Med Phys. 1991 May-Jun;18(3):449-52. doi: 10.1118/1.596692.
Dose measurements using LiF thermoluminescent dosimeters (TLD) have been performed for single 103Pd seeds (model 200) at the center of a solid water phantom. TLD cubes 1 mm on an edge were used for measurements from 1 mm to 1 cm at 1-mm intervals. The cubes were centered along transverse and longitudinal axes and along radial lines from seed center at 10 degrees increments. TLD chips of dimension 3.1 X 3.1 X 0.89 mm were used at distances of 2, 2.5, 3, and 4 cm at 15 degrees angular intervals. Data are presented as the product of distance squared and dose rate per unit source strength, plotted versus distance and angle. At 1 cm from seed center along the transverse axis this product was found to be 0.88 cGy cm2 mCi-1h-1. A dose-rate table in polar coordinates has been formulated for use with multiseed dose distribution calculations. Comparison with data of Meigooni et al. [Endocuriether./Hyperthermia Oncol. 6, 107-117 (1990)] shows general agreement for distances of 2 cm or greater. A comparison of our transverse axis data with Russell's calculated values (Theragenics Internal Report, 4 November 1984) for an ideal point source of 103Pd shows very good agreement except at distances less than 0.5 cm, where differences are attributable to the extended source effect in the actual seed.
已使用氟化锂热释光剂量计（TLD）对固体水模体中心的单个103Pd种子（型号200）进行了剂量测量。使用边长为1毫米的TLD立方体在1毫米至1厘米范围内以1毫米的间隔进行测量。这些立方体沿横向和纵向轴以及从种子中心沿径向线以10度增量居中放置。尺寸为3.1×3.1×0.89毫米的TLD芯片在2、2.5、3和4厘米的距离处以15度角间隔使用。数据表示为距离平方与每单位源强度剂量率的乘积，绘制为距离和角度的函数。在沿横轴距种子中心1厘米处，该乘积为0.88 cGy cm2 mCi-1h-1。已制定了极坐标中的剂量率表，用于多种子剂量分布计算。与Meigooni等人的数据[Endocuriether./Hyperthermia Oncol. 6, 107 - 117 (1990)]比较表明，对于2厘米或更大的距离，总体一致。将我们横轴数据与Russell对103Pd理想点源的计算值（Theragenics内部报告，1984年11月4日）进行比较，结果显示除了在小于0.5厘米的距离处，两者非常吻合，在该距离处的差异归因于实际种子中的扩展源效应。
