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目的研究125Ⅰ粒子源的剂量场分布。方法采用Monte Carlo模拟法和美国医学物理学家协会43报告工作组(AAPM TG-43)推荐的理论计算公式(理论计算法)对125Ⅰ粒子源的径向剂量进行研究,并对Monte Carlo模拟法和理论计算结果进行比较。结果当125Ⅰ粒子源活度为37MBq,粒子源的径向距离分别为0.5、1.0、1.5和2 cm时,用Monte Carlo法模拟计算得的径向剂量率分布为3.19、0.89、0.41、0.22 cGy/h,理论计算法分别为3.87、0.95、0.39、0.22 cGy/h。结论 Monte Carlo模拟法和理论计算法有较好的一致性,125I粒子源的径向剂量率随距离增加快速下降。
Objective To study the dose field distribution of 125 Ⅰ particle source. Methods The radial dose of 125 I particle source was studied by Monte Carlo simulation method and the theoretical calculation formula recommended by the AAPM TG-43 Report Working Group (AAPM TG-43). Monte Carlo simulation And the theoretical calculation results are compared. Results When the 125 Ⅰ particle activity was 37 MBq and the radial distances of the particle sources were 0.5, 1.0, 1.5 and 2 cm respectively, the radial dose rate distribution calculated by Monte Carlo method was 3.19, 0.89, 0.41 and 0.22 cGy / h, the theoretical calculation method was 3.87,0.95,0.39,0.22 cGy / h. Conclusion The Monte Carlo simulation method is in good agreement with the theoretical calculation method. The radial dose rate of 125I particle source declines rapidly with increasing distance.