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. Author manuscript; available in PMC: 2019 Apr 11.
Published in final edited form as: J Radioanal Nucl Chem. 2018;318:10.1007/s10967-018-6032-9. doi: 10.1007/s10967-018-6032-9

Fig. 3.

Fig. 3

Massic activity values calculated from measured 229Th RM—SRM 4328C activity ratios and direct measurements by IDAS. Error bars for data points are combined standard uncertainties with the exception of the “Combined IDAS” values which is shown with an expanded uncertainty (k = 2). Note that only the LSC, Standard Addition LSC, and NaI(Tl) data were used to determine the “Combined Activity Ratio Based Value” and “Expanded Uncertainty” interval shown in the figure. All data are presented for a reference date of 31 December 2007