Pencil Beam Spectral Measurements of Ce, Ho, Yb, and Ba Powders for Potential Use in Medical Applications

Table 4

Mean and maximum energies for the selected dual-kVp filters.

kVp (keV)	Element	Areal density	Mean energy	Maximum energy
		(g/cm^2)	(keV)	(keV)
70	Ho	0.7619	50.31	55
80	Yb	0.9422	56.13	61
90	Yb	1.0095	56.89	61