Field size (mm)

Relative scatter factor

10 × 10

0.697

20 × 20

0.820

30 × 30

0.866

40 × 40

0.896

60 × 60

0.941

80 × 80

0.974

100 × 100

1.000

120 × 120

1.022

150 × 150

1.046