Measured Dial Settings for 18F and 68Ge Mock Syringes in Several NIST-Maintained Activity Calibrators
| 18F | 68Ge | |||||
| Chamber | Previous dial setting | Dial setting | % activity | Previous dial setting | Dial setting | % activity |
| CRC-12 | 472(2) | 460(4) | 0.6 | 452(1) | 453(3) | 0.6 |
| CRC-15R | — | 447(3) | 0.5 | 442(1) | 436(3) | 0.5 |
| CRC-25PET | — | 459(2) | 0.4 | — | 451(2) | 0.5 |
| CRC-35R | — | 452(2) | 0.4 | 444(1) | 447(5) | 0.9 |
| CRC-1.8 atm | — | 496(2) | 0.4 | — | 488(3) | 0.5 |
| AL-500 | — | 10.1(2) | 2.0 | — | 10.1(1) | 0.5 |
Uncertainties (k = 1) are given in parentheses and are expressed as uncertainty in last digit of dial setting. % activity column gives uncertainty in measured activity value arising from uncertainty in dial setting. Values for previous dial settings for 18F and 68Ge are from Cessna et al. (11) and Zimmerman and Cessna (3), respectively.