Abstract:

The dose distribution of ¹²⁵I source in water was studied by means of Monte Carlo simulations and thermo luminescent dosemeter (TLD) method, and the results were compared. The results show that when ¹²⁵I source activity was 1.37×107 Bq, the radial distances of ¹²⁵I source were 0.5,1.0,1.5 and 2 cm, the dose rates of ¹²⁵I with MCNP method were 11.7,3.3,1.5,0.8 mGy/h, TLD  measurements were 12.2,3.1,1.3,0.7 mGy/h;  125I source radial dose rate decreased rapidly with increasing distance.

Key words: Monte Carlo code for neutron and particle, dose rate, thermo luminescent dosemeter, ¹²⁵I source