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EJNMMI Radiopharmacy and Chemistry
Fig. 6 | EJNMMI Radiopharmacy and Chemistry

Fig. 6

From: Gamma counting protocols for the accurate quantification of 225Ac and 213Bi without the need for a secular equilibrium between parent and gamma-emitting daughter

Fig. 6

A 225Ac activities measured with \({\text{EW}}_{{221_{{{\text{Fr}}}} }}\) with and without scatter correction are plotted as function of measurement time for the sample 3 (see Table 1) containing 225Ac and additional 213Bi activity. Error bars represent the standard deviation provided by the GC software. B Relative bias (percentage relative difference) of 225Ac activity estimated using \({\text{EW}}_{{221_{{{\text{Fr}}}} }}\) as function of the added 213Bi activity (compared to SEq between 225Ac and 213Bi) when no correction for the additional down scatter of 213Bi gamma-emissions in the \({\text{EW}}_{{221_{{{\text{Fr}}}} }}\) is applied

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