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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Appl Radiat Isot. 2017 Jul 27;134:23–31. doi: 10.1016/j.apradiso.2017.07.050

Fig. 2.

Fig. 2.

Molality measurement results for 229Th. Error bars are expanded uncertainties (U = k uc) calculated for individual IDMS molality measurements. The solid line is the reference material value based on the weighted mean of IDMS molality measurements made using Dilution 2, 2A, and 2B spikes. The dashed lines bracket an expanded uncertainty interval for the reference material value (k = 2). Data for IDMS measurements made using SRM 4342A as a 230Th spike are shown for verification purposes. The estimated massic activity for the 229Th reference material and published 229Th half-lives were used to calculate “Activity Based” values for 229Th molality.