| Unknown sample concentrations | |||||||
| Count rate converted to concentration using the outlier-affected bootstrap calibration | |||||||
| Count rate (counts) | Estimated concentration (ppm) | Median concentration (ppm) | 68 % CI (ppm) | 95 % CI (ppm) | |||
|---|---|---|---|---|---|---|---|
| Lower 68 % CI (ppm) | Upper 68 % CI (ppm) | Lower 95 % CI (ppm) | Upper 95 % CI (ppm) | ||||
| Unknown 1 | 150 | 226.67 | 225.88 | 219.86 | 234.38 | 214.43 | 247.47 |
| Unknown 2 | 400 | 249.88 | 250.89 | 242.79 | 260.67 | 237.06 | 274.55 |
| Unknown 3 | 850 | 291.66 | 293.75 | 277.33 | 315.76 | 266.40 | 340.01 |
| Unknown 4 | 1,600 | 361.28 | 364.15 | 331.23 | 411.29 | 310.36 | 460.99 |
| Calibration fit: concentration (ppm) = slope × count rate + intercept, fit with two retained potential outliers. Confidence intervals propagated from 2000 bootstrap resamples of the outlier-affected ODR fit. | |||||||