Table 2.

Optimal gap separation between adjacent electron beams for different energies at 70 cm SSD that would result in uniform profile at ${\mathrm{D}}_{max}$ for each of the energies.

Energy	6 MeV	9 MeV	12 MeV	16 MeV	20 MeV
6 MeV	0.4	0.4	0.45	0.5	0.4
9 MeV	0.4	0.56	0.5	0.55	0.45
12 MeV	0.45	0.5	0.6	0.65	0.5
16 MeV	0.5	0.55	0.65	0.65	0.6
20 MeV	0.4	0.45	0.5	0.6	0.7