Fig. 1
Fig. 2
Results from the Procorad 2021 proficiency test
| Sample | Reference value (Bq·L−1) | Bateman equation-based procedure (Bq·L−1) |
|---|---|---|
| 21SRB | 3.11 ± 0.17 | 3.28 ± 0.56 |
| 21SRC | 6.06 ± 0.34 | 6.06 ± 1.03 |
Statistical evaluation of the 90Sr recovery in immediate and delayed measurements
| Fortification level (Bq·kg−1) | Immediate | Delayed | ||||||
|---|---|---|---|---|---|---|---|---|
| Mean (%) | Median (%) | SD (%) | n | Mean (%) | Median (%) | SD (%) | n | |
| 5 | 85 | 83 | 10 | 12 | 84 | 83 | 4 | 28 |
| 50 | 82 | 82 | 2 | 12 | 80 | 80 | 3 | 31 |
| Total | 83 | 82 | 7 | 24 | 82 | 81 | 4 | 59 |
Validation characteristics of the applied method
| Characteristics | Result |
|---|---|
| Linearity | 100% |
| MDA | 0.017 Bq·kg−1 |
| Recovery of 90Sr | 82% |
| Relative bias | −18% |
| Repeatability (CV)a | 8.5% |
| Reproducibility (CV)a | 9% |
| Combined standard uncertainty (k = 2)b | 17% |