Table 1.
Ion chamber and NaI(Tl) measured activities. Single measurements were taken in each detector. Notice that as the ion chamber readings increase, the discrepancies with the NaI(Tl) increase. All values in kBq. Note that the uncertainties in the ion chamber readings are expressed as 10% in accordance with the calibration measurements in the activity range (above). The NaI(Tl) uncertainties are expressed as the propagation of uncertainties in all steps of the calculation. The difference between the ion chamber readings and the NaI(Tl) determined activity for 225Ac are indicated in the last column to the right.
| Ion Chamber Reading | NaI(Tl) Determined Activities | |||
|---|---|---|---|---|
| 225Ac | 221Fr | 213Bi | 225Ac Percent Difference | |
| 70.3 ± 7.0 | 57.35 ± 7.57 | 66.97 ± 8.18 | 63.64 ± 7.98 | 20.23 |
| 144.3 ± 14.4 | 96.20 ± 9.81 | 115.07 ± 10.73 | 111.74 ± 10.57 | 40.00 |
| 222.0 ± 22.2 | 124.69 ± 11.17 | 152.81 ± 12.36 | 143.93 ± 12.00 | 56.14 |
| 299.7 ± 30.0 | 140.23 ± 11.84 | 177.97 ± 13.34 | 165.39 ± 12.86 | 72.50 |
| 370.0 ± 37.0 | 152.07 ± 12.33 | 198.32 ± 14.08 | 182.41 ± 13.51 | 83.49 |
| 447.7 ± 44.7 | 140.23 ± 11.84 | 211.64 ± 14.55 | 187.59 ± 13.70 | 104.59 |