| Det. Efficiency (%) | 102-T | 134-T | 140-F | 102-T | 134-T | 140-F |
| Parameter | 226Ra | |||||
| 37.0 ± 1.0 (mBq/L) | 187.4 ± 5.0 (mBq/L) | |||||
| Measured mean (mBq/L) | 34.0 | 35.5 | 33.9 | 186.2 | 178.5 | 177.1 |
| Measured std. dev. (mBq/L) | 9.0 | 7.7 | 4.5 | 18.0 | 8.5 | 9.9 |
| En score (95% CL) | −0.17 | −0.10 | −0.35 | −0.03 | −0.46 | −0.47 |
| Degrees of freedom | 7 | 8 | 7 | 8 | 8 | 9 |
| Observed χ2 | 8.7 | 9.2 | 12.5 | 13.7 | 8.1 | 17.8 |
| Calculated χ2 | 18.5 | 20.1 | 18.5 | 20.1 | 20.1 | 21.7 |
| Parameter | 228Ra | |||||
| 37.0 ± 0.8 (mBq/L) | 176.8 ± 4.0 (mBq/L) | |||||
| Measured mean (mBq/L) | 39.8 | 39.1 | 36.5 | 186.3 | 188.9 | 174.8 |
| Measured std. dev. (mBq/L) | 7.7 | 7.2 | 3.5 | 17.0 | 8.6 | 12.5 |
| En score (95% CL) | 0.19 | 0.15 | −0.02 | 0.28 | 0.65 | −0.08 |
| Degrees of freedom | 7 | 8 | 8 | 10 | 10 | 9 |
| Observed χ2 | 2.2 | 4.1 | 3.3 | 8.6 | 5.8 | 15.9 |
| Calculated χ2 | 18.5 | 20.1 | 20.1 | 23.2 | 23.2 | 21.7 |