Table 2
Back face signature (BFS) depth:volume data for 0° pencilling shots
Air-gap (mm)
BFS depth (mm)
BFS depth:volume
0
55
1.57
10
34
1.21
10
37
1.06
10
40
1.21
10
48
1.07
10
50
1.00
15
42
1.17
15
58
1.18