Status of the AMS graphitization system in the dendrochronological laboratory at AGH-UST, Kraków Article Category: CONFERENCE PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE “METHODS OF ABSOLUTE CHRONOLOGY” JUNE 5-7TH, 2019, TARNOWSKIE GORY, POLAND Publié en ligne: 31 déc. 2020 Pages: 112 - 117 Reçu: 15 janv. 2020 Accepté: 29 mai 2020 © 2020 D. Wiktorowski., published by Sciendo This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Fig 1 Scheme of alpha cellulose extraction. Fig 2 AMS graphitization system in the Dendrochronological Laboratory at AGH-UST, Kraków: a) Reduction line and vacuum line for sample sealing and purification of CO2; b) cryogenically separation CO2 from water in glass vessel cooled in a dry ice/ethanol slurry and trapping CO2 in the glass valve cooled by liquid nitrogen; c) shows the vacuum line for graphite preparation. Fig 3 Changes in CO2 pressure during reduction for some of the reduced samples. The results of 14C AMS measurements of the samples prepared using the graphitization line in the Dendrochronological Laboratory at AGH-UST Krakow. N Lab code Sample ID Material pMC ± 14 C age years± Weight C [mg] 1 UGAMS 40065 C14_10 OXII 133.82 0.33 1 2 UGAMS 34241 C14_5 OXII 134.69 0.28 1 3 UGAMS 34242 C14_5A OXII 133.43 0.28 1 4 UGAMS 41465 C14_11 OXII 135.11 0.30 1 5 UGAMS 41466 C14-12 OXII 133.07 0.30 1 6 UGAMS 41699 C14_13 OXII 134.78 0.41 1 7 UGAMS 41702 C14_15 OXII 133.31 0.41 1 8 UGAMS 41700 C14-13B OXII 134.68 0.33 0.3 9 UGAMS 41701 C14-14 OXII 133.45 0.33 0.36 10 UGAMS 42224 C14_11A OXII 135.20 0.26 1 11 UGAMS 42225 C14_12A OXII 132.83 0.36 1 12 UGAMS 35610 C14_7 OXII 134.02 0.31 1 13 UGAMS 35611 C14_7A OXII 134.11 0.32 1 14 UGAMS 36945 C14_7B OXII 135.21 0.31 1 15 UGAMS 36946 C14-9 OXII 132.89 0.31 1 16 UGAMS 37297 C14_9A OXII 134.48 0.31 1 17 UGAMS 37298 C14_9B OXII 133.64 0.31 1 18 UGAMS 43566 C14_16 OXII 133.99 0.34 1 19 UGAMS 43567 C14_16A OXII 134.48 0.43 0.34 20 UGAMS 43568 C14_16B OXII 132.88 0.39 0.1 21 UGAMS 40066 WIT_10 vitrinite 0.391 0.011 42096 147 1 22 UGAMS 40067 WIT_10A vitrinite 0.385 0.011 42200 155 0.65 23 UGAMS 34243 WIT_3D vitrinite 0.546 0.013 41854 195 1 24 UGAMS 34244 WIT_5 vitrinite 0.576 0.014 41427 198 1 25 UGAMS 41467 WIT_11 vitrinite 0.549 0.013 41811 194 1 26 UGAMS 41468 WIT_12 vitrinite 0.765 0.047 39141 512 1 27 UGAMS 41695 WIT_11A vitrinite 0.568 0.012 41532 203 1 28 UGAMS 41696 WIT_12A vitrinite 0.684 0.016 40043 184 1 29 UGAMS 41697 WIT_13B vitrinite 0.942 0.021 37471 177 0.32 30 UGAMS 41698 WIT_13C vitrinite 0.951 0.020 37400 166 0.35 31 UGAMS 42222 WIT_13 vitrinite 1.020 0.016 36834 124 1 32 UGAMS 42223 WIT_14 vitrinite 0.672 0.014 40187 166 1 33 UGAMS 35612 WIT_6 vitrinite 1.961 0.025 30010 83 1 34 UGAMS 35613 WIT_7 vitrinite 0.432 0.010 43770 179 1 35 UGAMS 36947 WIT_7A vitrinite 0.696 0.024 39899 280 1 36 UGAMS 36948 WIT_9 vitrinite 0.658 0.021 40316 256 1 37 UGAMS 37299 WIT_7B vitrinite 1.410 0.060 34233 165 1 38 UGAMS 37300 WIT_9A vitrinite 1.385 0.081 34377 225 1 39 UGAMS 43569 WIT15 vitrinite 0.388 0.010 44601 207 1 40 UGAMS 43570 WIT15A vitrinite 0.482 0.013 42862 214 0.34 41 UGAMS 43571 WIT15B vitrinite 0.943 0.038 37461 325 0.1 42 UGAMS 31703 C5_1 IAEA C5 23.32 0.11 11696 36 1 43 UGAMS 42226 C5_2 IAEA C5 23.47 0.85 11644 29 1 44 UGAMS 36949 C5_1B IAEA C5 23.16 0.09 11750 30 1 45 UGAMS 34245 C6_1B IAEA C6 149.44 0.44 1 46 UGAMS 35614 C7_1 IAEA C7 50.55 0.15 5479 23 1 47 UGAMS 35615 C7_2 IAEA C7 50.99 0.14 5410 21 1 48 UGAMS 41489 C7_2A IAEA C7 50.26 0.16 5526 25 1 49 UGAMS 37301 C7_1A IAEA C7 49.72 0.15 5616 27 1
Relationship between measured and expected values. Material n Consensus value 14 C (pMC) Average measured value 14 C (pMC) NIST OxII 20 134.07±0.17 134.05±0.17 Background (vitrinite) 21 0 0.781±0.023 IAEA C5 3 23.05±0.02 23.31±0.35 IAEA C6 1 150.61±0.11 149.44±0.44 IAEA C7 4 49.53±0.12 50.38±0.15