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As a result of a recent change in the National Institute of Standards and Technology (NIST) activity standard for (18)F, we have determined new relative response ratios for a (68)Ge solid epoxy mock syringe source used in activity calibrators as a long-lived substitute for (18)F. New standardized solutions of each radionuclide were used to determine the response ratios while maintaining traceability to national standards. This work updates our previously published data from 2010.

the journal of nuclear medicine

Impact of Recent Change in the National Institute of Standards and Technology Standard for <sup>18</sup>F on the Relative Response of <sup>68</sup>Ge-Based Mock Syringe Dose Calibrator Standards

Impact of Recent Change in the National Institute of Standards and Technology Standard for 18F on the Relative Response of 68Ge-Based Mock Syringe Dose Calibrator Standards

Impact of Recent Change in the National Institute of Standards and Technology Standard for ¹⁸F on the Relative Response of ⁶⁸Ge-Based Mock Syringe Dose Calibrator Standards