点核积分计算6711型^(125)I籽粒源剂量参数  

Determination of dosimetric characteristics for the model number 6711 ^(125)I seed source with the point-kernel method

作　　者：孟贝蒂 曹振[3,4] 石翠燕 崔海平[1,2] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]原子高科股份有限公司,北京102413 [3]同方威视技术股份有限公司,北京100084 [4]清华大学工程物理系,北京100084

出　　处：《核技术》2017年第7期35-39,共5页Nuclear Techniques

摘　　要：使用点核积分方法计算6711型^(125)I籽粒源参数,根据美国医学物理学家协会(American Association of Physicists in Medicine,AAPM)TG-43U1号报告推荐的剂量参数计算公式,可以获得6711型^(125)I籽粒源各参数。与AAPM TG-43U1推荐值比较,剂量常数相差6.76%,径向剂量函数值(不包括0.1 cm、0.15 cm、0.25 cm)最大相差2.27%,最小相差0.02%;与MCNP5(A General N-Particle Transport Code,Version 5)方法计算结果比较,剂量常数相差6.19%,径向剂量函数值(不包括0.1 cm、0.15 cm、0.25 cm)最大相差6.65%,最小相差0.06%。结果与推荐值符合较好,证明点核积分能够应用于籽粒源剂量参数计算。Background： The 125I brachytherapy source has become a popular treatment option in the treatment various tumors, in order to reduce the risk of surrounding normal tissue, it is important to know the dosimetric characteristics of seed source. Purpose： The aim is to develop a reliable and saving time method for calculating the dosimetric parameters of seed source. Methods： Dosimetric parameters （dose rate constant, radial dose function and anisotropy function） of the model number 6711 125I seed source are calculated with point-kernel method following American association of physicists in medicine （AAPM） TG-43U1 recommendations. Results： The result was compared with the relative data recommended by AAPM TG-43U1 and Monte-Carlo （M-C） method. Dose rate constant with AAPM was in agreement with 6.76%, and that with M-C is 6.19%; radial dose function （except 0.1 cm, 0.15 cm and 0.25 cm） with AAPM is within 0.02%-2.27%, and that with M-C is within 0.06%-6.65%. Conclusion： The point-kernel method can be applicable to calculate the dosimetric characteristics of seed sources.

关 键 词：点核积分方法 剂量学参数 125Ⅰ籽粒源 

分 类 号：TL929[核科学技术—核燃料循环与材料]