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Table 3 Dose conversion factors (ratios of total reference air kerma per seed) for different prescription depths (1 mm – 10 mm in 1 mm intervals) for standard COMS plaques loaded with 125I seeds (model IAI-125A). A reference depth for dose conversion factors is 5 mm

From: A practical approach to estimating optic disc dose and macula dose without treatment planning in ocular brachytherapy using 125I COMS plaques

Prescription depth (mm) Plaque size (mm) in diameter
10 12 14 16 18 20 22
1 0.29 0.33 0.37 0.42 0.44 0.47 0.47
2 0.41 0.45 0.48 0.52 0.55 0.58 0.59
3 0.57 0.60 0.63 0.66 0.68 0.70 0.71
4 0.77 0.78 0.80 0.81 0.83 0.84 0.85
5 1.00 1.00 1.00 1.00 1.00 1.00 1.00
6 1.27 1.25 1.23 1.22 1.20 1.18 1.18
7 1.59 1.54 1.50 1.47 1.43 1.40 1.38
8 1.95 1.88 1.82 1.76 1.69 1.64 1.61
9 2.37 2.27 2.18 2.10 2.00 1.92 1.87
10 2.84 2.71 2.59 2.48 2.34 2.24 2.17