Dose Distribution Around an¹²⁵I Seed Source in Tissue

Abstract

Dose distribution about an 125I source in tissue has been calculated using absorbed dose constant and point isotropic source buildup factors. The effect of encapsulation material has been included. Depth-dose values have been verified by measurements with thermoluminescent dosimeters. Present data gives a value for absorbed dose constant of 1.32 rads cm2/mCi-hr. compared to the presently used value of 1.7. Depth-dose values are compared with other published data.