The dose distribution after the implantation of radioactive sources in the human body is very important of its effectness.Therefore

the source identified the importance of the dose distribution.Short-term source of I-125 because of their low-energy

short half-life

and implantation of the lymphatic system

continuity of radiotherapy

in 5 to 10 after the radioactive half-life that is disappearing

nowin clinical cancer therapy is widely used.In this paper

6711-I-125 short-range source of Monte Carlo simulation of a dose distribution was provided which was compared to the results by AAPMTG43U1 recommended dose calculation formula.The paper briefly introduced I-125 source of the characteristics

MCNP and procedures used in its water-dose distribution in the simulation

then the results come with software to the origin of the deposition to a distribution was given.