Table 3.

Estimation of the m values for different tube voltage values

kVp	m (cm-1)
26	0.65 ± 0.03
28	0.60 ± 0.02
30	0.55 ± 0.02
32	0.52 ± 0.02
34	0.48 ± 0.02
36	0.46 ± 0.01
38	0.44 ± 0.01
40	0.42 ± 0.01
44	0.39 ± 0.01
48	0.36 ± 0.01

Data for m values are presented as mean ± standard deviation. The m values were obtained by fitting experimental data through Eq. (4), as shown in Fig. 1. The fitting parameters of Eq. (4) are presented in Table 2