Fig. 5.

Plots of efficiency-traced massic activity C_A (in Bq · g⁻¹) for ⁶³Ni experiments using the Beckman and Packard spectrometers with two different commercially-available scintillation fluids, Ready Safe and Ultima Gold. Referring to Table 1, Fig. 5a contains data from experiments “A” (circles), “E” (squares), “G” (diamonds), and “H” (triangles), all with aqueous fraction of cocktail f = 0.001; Fig. 5b contains data from experiments “I” and “J”; and Fig. 5c contains data from experiments “AA” and “AC.” Water fractions in Figs. 5a and 5c were nominally 3 % and 10 %, respectively. The uncertainty bars represent measurement repeatability for the same LS cocktail with typical degrees of freedom ν = 5.