Fig. 5.

The solid trace in Fig. 5a shows the measured absorbance in holder 1 for a cuvette containing a mixture of microspheres and holmium oxide in an aqueous buffer. The dotted trace in Fig. 5a shows the measured absorbance when the cuvette is transferred to holder 2. The solid trace in Fig. 5b shows the molecular absorption coefficient obtained using Eq. (8) and Eq. (9) and the data in Fig. 5a. The dotted trace in Fig. 5b (overlaps the solid trace) shows the measured molecular absorption coefficient of an equivalent solution of holmium oxide without the microspheres. The solid trace in Fig. 5c shows the apparent scattering absorption coefficient obtained using Eq. (8) and Eq. (9) and the data in Fig. 5a. The dotted trace in Fig. 5c shows the measured apparent scattering absorption coefficient of an equivalent suspension of microspheres without holmium oxide.