Table 7.

Phantom Scatter correction factor (Sp) of Theratron phoenix Co-60 for square fields compared with S and G data and MDS Co-60 Theratron 780 ESTRO Booklet No:6 published data

Square field size (X/Y) (cm)	Theratron phoenix	S and G Data Co-60	MDS Co-60 Theratron 780	% Deviation with S and G data
5	0.884	0.871	0.898	1.49
6	0.912	0.904	0.918	0.88
8	0.962	0.945	0.961	1.80
10	1.000	1.000	1.000	0.00
15	1.053	1.068	1.069	−1.40
20	1.083	1.104	1.110	−1.90
25	1.109	1.135	1.150	−2.29
30	1.118	1.150	1.166	−2.78
35	1.134	1.165	1.186	−2.66

PMMA - Polymethyl methacrylate