Safeguards Analytical Laboratory
Quality Assurance and Computer Services group
Warning and Control Limits for SAL control measurements
(limits for the bias of a single QC measurement result)
Method |
control material |
measurand | limits |
|
control |
warning |
|||
| Gamma-Spec | NBS020, NBS030 | 235U wt% | 0.50 |
0.33 |
| HRGS | NBS947, SAL9984 | 241Am | 1.97 |
1.47 |
| 238:239 | 3.56 |
2.66 |
||
| 240:239 | 1.93 |
1.46 |
||
| 241:239 | 1.50 |
1.13 |
||
| Alpha-Spec | NBS947, AEA90099 | act.ratio | 1.17 |
0.85 |
| IDMS LSD | LSD control | Pu conc. | 0.41 |
0.31 |
| U conc | 0.22 |
0.17 |
||
| IDMS product | UK82522 or mixture | Pu conc. | 0.48 |
0.36 |
| NBL112A (NBS960) or mixture | U conc | 0.43 |
0.30 |
|
| MassSpec Pu | NBS947 | 240:239 | 0.19 |
0.14 |
| 242:239 | 0.51 |
0.38 |
||
| UK-Pu-3 | 240:239 | 0.11 |
0.085 |
|
| 242:239 | 0.21 |
0.16 |
||
| UK-Pu-4 | 240:239 | 0.18 |
0.13 |
|
| UK-Pu-5 | 240:239 | 0.18 |
0.13 |
|
| 242:239 | 0.32 |
0.23 |
||
| 244:239 | 0.36 |
0.27 |
||
| UK-Pu-6 | 240:239 | 0.15 |
0.11 |
|
| NBL-128 | 242:239 | 0.20 |
0.15 |
|
| CBNM-047a | 244:239 | 0.30 |
0.22 |
|
| MassSpec U | NBS010 | 235:238 | 0.36 |
0.27 |
| NBS020a, NBS030a | 235:238 | 0.20 |
0.15 |
|
| NBS100 to NBS930 NBL116, GUS3568, CBNM-072/2 |
235:238 | 0.22 |
0.16 |
|
| CBNM-072/2, GUS3568 | 233:238 | 0.26 |
0.20 |
|
| GUS3568 | 236:238 | 0.15 |
0.11 |
|
| McD&S | UK-Pu-1 (as control material) | Pu conc. | 0.23 |
0.17 |
| D&G Pu-Lab | EC-110 | U conc. | 0.26 |
0.19 |
| D&G U-Lab | EC-110 | U conc. | 0.12 |
0.09 |
These Warning and Control Limits consider the uncertainty of the certified reference values and the uncertainty of physical constants like radioactive decay half-lifes. Warning and Control Limits are defined in accordance with ISO Standard 3534 "Statistics -- Vocabulary and symbols