Background: Iodine-125 seeds brachytherapy is a cancer treatment method with seeds implanted in tumor tissue. Before clinic application

experiments should be done to determine the dosimetric parameters of seed due to their influences on treatment effects. In this paper

using thermoluminescent dosimeters (TLD) method

axial and radial dose distribution of Iodine-125 seed are measured and analyzed in the lumen tissue model. Purpose: The aim is to investigate the radial and axial dosimetric properties of I-125 seed

and provide scientific data for cavity cancers treatments with seeds brachtherapy. Methods: LiF (Mg

Cu

P) TL flake

grain and glass dosimeters were used for analog measurements of dose distribution inside the cavity phantom. Three kinds of TLD were measured by FJ-427A1 spectrometer after irradiation. Results: The radial dose distribution at different directions was anisotropic

and the variance of axial dose distribution was more than 10%. These results indicated that the iodide rod inside the titanium tube might deviate from the center of the axial. Conclusion: It is necessary to study the influences of seeds dosimetric parameters and arrangements on possible brachytherapy effects.Cited