Table 8.
Summary of OSL results obtained by the University of the Witwatersrand for samples of Unit 1 from the Dinaledi Chamber (samples OSL3, 4 and 5). The ages were calculated using effective U concentration values (taking disequilibrium into account; see text for details). CAM = Central Age Model; MAM = Minimum Age Model.
| Sample ID | H2O (%) | Th (ppm) | U (ppm) pre-Rn | U (ppm) post-Rn | K (%) | Total dr (Gy/ka) | 2σ | Total de (Gy) CAM | 2σ | Total de (Gy) MAM | 2σ | CAM Age (ka) |
CAM 2σ |
MAM age (ka) | MAM 2σ | Over dispersion (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OSL3 | 18.9 ± 5 | 3.71 ± 1.60 | 0.75 ± 0.177 | 0.193 ± 0.044 | 0.45 ± 0.12 | 0.76 | 0.07 | 428.59 | 68.92 | 176.4 | 27.7 | 560 | 103 | 231 | 41 | 63 |
| OSL4 | 25.8 ± 5 | 3.38 ± 1.60 | 0.485 ± 0.177 | 0.097 ± 0.044 | 0.47 ± 0.12 | 0.70 | 0.06 | 379.89 | 43.58 | 168.0 | 20.7 | 546 | 79 | 241 | 37 | 55 |
| OSL5 | 22.7 ± 5 | 5.11 ± 1.60 | 0.692 ± 0.177 | 0.138 ± 0.044 | 0.56 ± 0.12 | 0.90 | 0.07 | 759.54 | 102.33 | 315.67 | 48.68 | 849 | 132 | 353 | 61 | 68 |