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国产6711型125I粒子源剂量学参数模拟研究

Dosimetric Parameter Simulation of Domestic 6711 125I Seed Source

    摘要
  • 摘要: 采用MCNP软件对国产6711型125I粒子源剂量率常数、径向剂量函数、一维各向异性函数和二维各向异性函数等四个剂量学参数进行模拟计算研究。结果表明，剂量率常数与TG 43-U1报告推荐值误差为-0.83%；获得了（0.05~10） cm范围内的径向剂量函数，并对（0.25~10） cm范围数据进行五阶多项式拟合，提高了拟合函数的精度；得到（0.25~7） cm范围内的一维各项异性函数和二维各向异性函数，通过与文献比较，发现国产6711型粒子源源芯结构的差异会引起一维各向异性函数和二维各向异性函数的偏大现象。

     

    Abstract: The dose rate constant, radial dose function, one-dimensional anisotropy function and two-dimensional anisotropy function of domestic 6711 particle source were simulated by MCNP software. The error between the dose rate constant and the recommended value reported by TG 43-U1 was -0.83%. The radial dose function in the range of 0.05-10 cm was obtained, and the fifth-order polynomial fitting of the data in the range of 0.25-10 cm was proposed to improve the accuracy of the fitting function. The one-dimensional anisotropy function and the two-dimensional anisotropy function in the range of 0.25-7 cm are obtained, and compared with the relevant literature, it can be seen that the difference of the structure of the domestic type 6711 particle core will cause the phenomenon of the one-dimensional anisotropy function and the two-dimensional anisotropy function.

     

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