Dosimetric Parameter Simulation of Domestic 6711 ¹²⁵I Seed Source

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.