Table 1.
Photon counts and standard deviation for the background and 200 mGy irradiated salt samples for five sets of measurements on three instruments, with calculated sensitivities and detection limits.
| Instrument and wavelength | |||||
|---|---|---|---|---|---|
| PPSL | Portable OSL 1 | Portable OSL 2 | |||
| IR (890 nm) | IR (940 nm) | IR (890 nm) | OSL (470 nm) | ||
| Background (empty chamber) | 20 ± 34 | −10 ± 32 | −4 ± 31 | 45 ± 25 | −61 ± 26 |
| MDL (counts) | 123 | 95 | 94 | 74 | 78 |
| Pre-irradiation counts | 113 ± 72 | −4 ± 73 | −146 ± 89 | −27 ± 128 | 673 ± 160 |
| 200 mGy counts | 279,200 ± 71,200 | 605,900 ± 60,900 | 65,500 ± 21,800 | 43,300 ± 1,700 | 230,3300 ± 80,700 |
| Sensitivity (counts mGy−1) | 1,400 ± 240 | 3,030 ± 300 | 330 ± 110 | 220 ± 10 | 11,520 ± 400 |
| MDD (mGy) | 0.088 | 0.031 | 0.286 | 0.340 | 0.0067 |