Table 6.

Average activity concentrations for the 133Ba epoxy-filled cylinders sources of a given volume, along with the percent difference between the averages, as determined from HPGe and VIC measurements. The uncertainties here are the combined uncertainties of the average standard uncertainty for each source combined with the standard deviation on the sources within each set. As described in the text, the final activity concentration value assigned to the 2 mL, 4 mL, and 6 mL series was (0.199 ± 0.003) MBq·g⁻¹, while that for the 23 mL sources was (0.0503 ± 0.0009) MBq·g⁻¹.

Series	CA, MBq/g, HPGe	CA, MBq/g, VIC	Δ
2 mL	0.196(4)	0.198(2)	1.1 %
4 mL	0.199(5)	0.201(2)	1.1 %
6 mL	0.197(3)	0.201(2)	2.4 %
23 mL	0.0493(5)	0.0502(5)	1.9 %