Table 7.
Summary of ESR dating results (2σ uncertainties) for two end-member scenarios: (i) complete burial of the samples, 80% Rn loss in the sediment and post Th-230 equilibrium in dental tissue (i.e., maximum age scenario); (ii) complete burial of the samples and post-Rn equilibrium in sediment (i.e., minimum age scenario). See text for detailed discussion.
| Sample: | 1767 | 1788 | 1810 | 1841 | ||
|---|---|---|---|---|---|---|
| Laboratory: | SCU | SCU | Cenieh-gu | SCU | Cenieh-gu | SCU |
| Scenario 1: 25 ± 10% Water, complete burial and 80% 222Rn degassing (maximum age scenario) Scenario 1: 25 ± 10% Water, complete burial and 80% 222Rn degassing (maximum age scenario) | ||||||
| internal dose rate (μGy a−1) | 1142 ± 515 | 190 ± 129 | 47 ± 47 | 323 ± 175 | 176 ± 176 | 1411 ± 596 |
| alpha (μGy a−1)* | 0 | 0 | 8 ± 2 | 0 | 8 ± 2 | 0† |
| beta dose rate, dentine (μGy a−1) | 73 ± 33 | 91 ± 62 | 64 ± 16 | 75 ± 41 | 51 ± 14 | –‡ |
| beta dose rate, sediment (μGy a−1) | 101 ± 24 | 105 ± 31 | 86 ± 17 | 95 ± 24 | 86 ± 18 | 358 ± 74 |
| gamma and cosmic (μGy a−1) | 549 ± 69 | 549 ± 69 | 549 ± 69 | 549 ± 69 | 549 ± 69 | 549 ± 69 |
| total dose rate (μGy a−1) | 1865 ± 521 | 935 ± 162 | 754 ± 87 | 1042 ± 194 | 870 ± 190 | 2318 ± 606 |
| p enamel | −0.03 | 0.49 | −0.02 | −0.70 | −0.77 | 0.91 |
| p dentine | 0.08 | 0.13 | −0.06 | 1.02 | 0.54 | – |
| Age (ka) | 104 ± 29 | 247 ± 42 | 211 ± 28 | 284 ± 51 | 267 ± 68 | 723 ± 181 |
| Combined SCU/CENIEH-GU age (ka) | 229 + 60/–46 | 276 + 59/–77 | ||||
| Average age for 1788 & 1810 (ka) | 253 + 82/–70 | |||||
| Scenario 2: 25 ± 10% Water, complete burial and no 222Rn degassing (minimum age scenario) Scenario 2: 25 ± 10% Water, complete burial and no 222Rn degassing (minimum age scenario) | ||||||
| internal dose rate (μGy a−1) | 1277 ± 552 | 216 ± 165 | 51 ± 51 | 335 ± 193 | 184 ± 184 | 1520 ± 630 |
| alpha (μGy a−1)* | 0 | 0 | 8 ± 2 | 0 | 8 ± 2 | 0 |
| beta dose rate, dentine (μGy a−1) | 82 ± 35 | 102 ± 78 | 69 ± 18 | 87 ± 50 | 59 ± 16 | -- |
| beta dose rate, sediment (μGy a−1) | 132 ± 26 | 134 ± 33 | 111 ± 19 | 126 ± 26 | 112 ± 19 | 380 ± 81 |
| gamma and cosmic (μGy a−1) | 739 ± 116 | 739 ± 116 | 739 ± 116 | 739 ± 116 | 739 ± 116 | 739 ± 116 |
| total dose rate (μGy a−1) | 2230 ± 586 | 1191 ± 219 | 978 ± 129 | 1287 ± 232 | 1102 ± 219 | 2639 ± 647 |
| p enamel | −0.31 | 0.06 | −0.37 | −0.83 | −0.91 | 0.67 |
| p dentine | −0.22 | −0.22 | −0.40 | 0.54 | 0.10 | – |
| Age (ka) | 87 ± 22 | 194 ± 34 | 163 ± 24 | 230 ± 40 | 210 ± 50 | 635 ± 148 |
| Combined SCU/CENIEH-GU age (ka) | 179 + 49/–40 | 220 + 50/–60 | ||||
| Average age for 1788 & 1810 (ka) | 200 + 70/–61 | |||||
*using alpha attenuation values of Grün (1987).
†considered as negligible given the low radioelement concentrations in the sediment and the high total dose rate value.
‡for 1841, the beta dose rate on both sides of the enamel layer is derived from the sediment.