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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: Appl Radiat Isot. 2020 Dec 31;170:109572. doi: 10.1016/j.apradiso.2020.109572

Table 5.

Uncertainty budget for the massic activity (Am) of the S3 224Ra solution determined at NPL by 4π(LS)-γ DCC.

Component ui/%
Standard uncertainty of the weighted mean 0.032
Gravimetric 0.050
Repeatability 0.10
γ-gate selection 0.10
Extrapolation 0.20
Decay correction 0.072
228Th impurity 0.010
Background correction 0.0030
Predicted equilibrium ratio of decay progeny 0.015
Pulse pile-up (LS-channel) 0.015
Pulse pile-up (γ-channel) 0.0050
LS-channel dead time 0.050
γ-channel dead time 0.050
Accidental coincidence correction 0.010
Combined standard uncertainty, uc 0.27