Article Figures & Data
Figures
- FIGURE 1.
Volume dependence of dose calibrator (CRC-12) dial setting, DS, on filling mass, m, in 3-mL Ace Glass v-vials. The uncertainty bars correspond to an expanded uncertainty interval with a coverage factor of k = 2. The line through the data is the resulting fit using an equation of the form (DS)−1 = a + b/m, where a and b are fitting constants.
- FIGURE 2.
Volume dependence of dose calibrator (CRC-12) dial setting, DS, on filling mass in 3-mL Wheaton v-vials. The uncertainty bars correspond to an expanded uncertainty interval with a coverage factor of k = 2. The line through the data is the resulting fit using an equation of the form (DS)−1 = a + b/m, where a and b are fitting constants.
Tables
- TABLE 1.
Input Atomic and Nuclear Data for EMI Calculations of the Detection Efficiencies of Electron Capture (EC) Branches in the Decay of Rhenium-186*
Variable name Input values, excited state branch Input values, ground state branch Atomic data ′WK, WL 0.587, 0.413 0.587, 0.413 PKLL, PLKM, PKMM 0.69, 0.29, 0.02 0.69, 0.29, 0.02 EKLL, EKLM, EKMM, ELMM 47.8, 56.2, 64.7, 8.0 47.8, 56.2, 64.7, 8.0 PKL, PKM 0.83, 0.17 0.83, 0.17 EKL, EKM, ELM 58.80, 67.1, 8.87 58.80, 67.1, 8.87 EK, EL, EM 69.5, 11.5, 2.37 69.5, 11.5, 2.37 Nuclear data PK, PL, PM 0.78, 0.16, 0.05 0.79, 0.16, 0.05 ′EGAM, PGAM 122.3, 1.0 — ′PCIK, PCIL, PCIM 0.33, 0.51, 0.13 — ↵* Nuclear data are taken from reference 5, atomic data are taken from reference 9. See reference 6 for an explanation of the input file format.
- TABLE 2.
Uncertainty Components Evaluated in the Determination of the Massic Activity CA (in units of MBq · g−1) for Rhenium-186 Perrhenate Solution Used in Experiment 1
Component Comment % LS measurement repeatability Standard deviation in CA for 10 repeated measurements on a single LS cocktail; average for 8 independent LS cocktails. 0.13 LS cocktail variability Standard deviation in CA for 8 independently prepared LS cocktails; average for 8 independent LS cocktails. 0.0091 LS composition variability Standard deviation for determination of CA for LS cocktails containing 0.9% aqueous fraction as H2O (4 cocktails) and 0.9% aqueous fraction as 9% saline (4 cocktails). 0.15 186Re half-life Standard uncertainty in half-life (0.08%) over the measurement decay interval. 0.0023 186Re EC branching ratio Standard uncertainty in EC branching (1.3%). 0.08 186Re β-branching ratio Standard uncertainty in β-branching (0.12%). 0.10 Gravimetric determinations Standard uncertainty in mass determinations for a single LS counting source. 0.05 186Re dilution factor Standard uncertainty in gravimetric determination of dilution from 186Re master solution 0.07 3H-standard decay correction Estimated standard uncertainty of 0.46% in the decay of the 3H standard over 18.5 a to 19 a. 0.01 3H-standard calibration Standard uncertainty of 0.18% from NIST calibration. 0.01 3H-standard gravimetric dilution Estimated standard uncertainty (0.06%) for gravimetrically-determined dilution factor. 0.01 Gravimetric determination of 3H LS samples Estimated standard uncertainty of 0.05% in the mass determination of any single 3H LS cocktail. 0.01 Spectrometer dependence Standard deviation in CA for 8 independently-prepared LS cocktails counted in 2 spectrometers. 0.56 Combined (uc = Σui) 0.61 Expanded (Uc = uc · k; k = 2) 1.22 - TABLE 3.
Uncertainty Components Evaluated in the Determination of the Massic Activity CA (in units of MBq · g−1) for Rhenium-186 Perrhenate Solution Used in Experiment 2
Component Comment % LS measurement repeatability Standard deviation in CA for 10 repeated measurements on a single LS cocktail; average for 5 independent LS cocktails. 0.10 LS cocktail variability Standard deviation in CA for 5 independently prepared LS cocktails; average for 5 independent LS cocktails. 0.21 186Re half-life Standard uncertainty in half-life (0.08%) over the measurement decay interval. 0.0043 186Re EC branching ratio Standard uncertainty in EC branching (1.3%). 0.08 186Re β-branching ratio Standard uncertainty in β-branching (0.12%). 0.10 Gravimetric determinations Standard uncertainty in mass determinations for a single LS counting source. 0.05 186Re dilution factor Standard uncertainty in gravimetric determination of dilution from 186Re master solution 0.07 3H-standard decay correction Estimated standard uncertainty of 0.46% in the decay of the 3H standard over 18.5 a to 19 a. 0.01 3H-standard calibration Standard uncertainty of 0.18% from NIST calibration. 0.01 3H-standard gravimetric dilution Estimated standard uncertainty (0.06%) for gravimetrically-determined dilution factor. 0.01 Gravimetric determination of 3H LS samples Estimated standard uncertainty of 0.05% in the mass determination of any single 3H LS cocktail. 0.01 Spectrometer dependence Standard deviation in CA for 5 independently-prepared LS cocktails counted in 2 spectrometers. 0.0001 Combined (uc = Σui) 0.28 Expanded (Uc = uc · k; k = 2) 0.56 - TABLE 4.
Variability in Activity Determinations Due to Inconsistencies in Glass Vial Construction for the Ace Glass and Wheaton Conical V-Vials*
Dose calibrator Dial setting Relative standard deviation Ace Glass vials Wheaton vials CRC-12 475 × 10 0.30% 0.15% CRC-12 450 × 10 0.35% 0.18% CRC-35R 450 × 10 0.21% 0.31% CRC-12 Ionization current‡ 0.22% 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.
