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Table 1 Build-up caps used for measurements

From: Collimator scatter factor: Monte Carlo and in-air measurements approaches

Type Material Thickness Water-equiv. thickness Energy range Diameter Name in the work
T30001.3.103 Acrylic 9.5 mm 11.0 mm 4–6 MV 26.3 mm PMMA_11
T30001.3.104 Acrylic 13.8 mm 16.0 mm 6–8 MV 34.9 mm PMMA_16
T30001.3.106 Acrylic 24.6 mm 28.5 mm 10–20 MV 56.5 mm PMMA_28
T30001.3.107 Acrylic 34.7 mm 40.2 mm 20–30 MV 76.7 mm PMMA_40
T30000.3.202 Brass 2.4 mm 16.7 mm 4–6 MV 12.1 mm Brass_17
T30000.3.205 Brass 8.0 mm 55.8 mm 10–20 MV 23.3 mm Brass_56