Tdimplant (Gy) α/β ratio for different value of equivalent external beam dose
72 Gy 74 Gy 78 Gy 80 Gy
180 0.64 0.67 0.71 0.74
170 0.71 0.75 0.79 0.83
160 0.80 0.84 0.88 0.93
150 0.90 0.95 1.00 1.05
145 0.96 1.01 1.06 1.12
140 1.03 1.08 1.14 1.20
135 1.10 1.16 1.23 1.29
130 1.19 1.25 1.32 1.40
125 1.28 1.36 1.44 1.52
120 1.40 1.48 1.57 1.66
115 1.53 1.62 1.72 1.82
110 1.68 1.79 1.90 2.02
105 1.87 1.99 2.13 2.27
100 2.10 2.24 2.40 2.57
Table 4: Variation of α/β ratio and the total implant dose Tdimplant with value of the external photon beam dose for 125I (RBE value of 2.0).