Fig. 6.

Plots of efficiency-traced massic activity C_A (Bq ·g⁻¹) for ⁶³Ni experiments involving two different commercially-available scintillation fluids, Ready Safe (circles) and Ultima Gold (squares), in the Beckman and Packard spectrometers. Fig. 6a contains data from experiments “A” and “G,” Fig. 6b from experiments “E” and “H,” Fig. 6c from “O” + ”P” and “Q” + “R,” and Fig. 6d from “S”+”T” and “U” + ”V.” Water mass fractions Figs. 6a and 6b were 0.1 %, while those for Figs. 6c and 6d varied from 0.3 % to 11 %. Uncertainty bars represent measurement repeatability for a single cocktail with typical degrees of freedom ν = 9.