Variability in Activity Determinations Due to Inconsistencies in Glass Vial Construction for the Ace Glass and Wheaton Conical V-Vials*

Dose calibratorDial settingRelative standard deviation
Ace Glass vialsWheaton vials
CRC-12475 × 100.30%0.15%
CRC-12450 × 100.35%0.18%
CRC-35R450 × 100.21%0.31%
CRC-12Ionization current0.22%0.18%
  • * The values reported are relative standard deviations (in %) arising from measurements made on 4 vials of each type in 2 different dose calibrators.

  • The ionization current was read from the CRC-12 dose calibrator, which was specially modified by the manufacturer.