Tdimplant (Gy) α/β ratio for different values of equivalent external beam dose
72.0 Gy 74.0 78.0 80.0 Gy
180 0.96 1.02 1.08 1.14
170 1.08 1.15 1.21 1.28
160 1.23 1.31 1.39 1.47
150 1.42 1.51 1.60 1.70
145 1.53 1.63 1.74 1.85
140 1.66 1.77 1.89 2.01
135 1.81 1.93 2.07 2.21
130 1.98 2.12 2.28 2.44
125 2.19 2.35 2.53 2.73
120 2.44 2.63 2.85 3.08
115 2.75 2.98 3.24 3.53
110 3.14 3.42 3.75 4.11
105 3.66 4.00 4.44 4.91
100 4.35 4.81 5.41 6.08
Table 3: Variation of α/β ratio and the total implant dose Tdimpant with value of the external photon beam dose for 125I (RBE value of 1.0).