For many of archaeology's rarest and most enigmatic bone artifacts (e.g. human remains, bone ornaments, worked bone), the destruction of the 500 mg material necessary for direct accelerator mass spectrometry (AMS) dating on graphite targets would cause irreparable damage; therefore many have not been directly dated. The recently improved gas ion source of the MICADAS (MIni CArbon DAting System) offers a solution to this problem by measuring gaseous samples of 5-100 μg carbon at a level of precision not previously achieved with an AMS gas ion source. We present the results of the first comparison between routine graphite dates of ca. 1000 μg C (2-3 mg bone collagen) and dates from aliquots of gaseous samples of <100 μg C (<0.2 mg bone collagen), undertaken with the highest possible precision in mind. The experiment demonstrates the performance of the AixMICADAS in achieving reliable radiocarbon measurements from <0.2 mg collagen samples back to 40,000 14C BP. The technique has great implications for resolving chronological questions for key archaeological artifacts.
Size matters: Radiocarbon dates of <200 μg ancient collagen samples with AixMICADAS and Its Gas Ion Source / Fewlass H.; Talamo S.; Tuna T.; Fagault Y.; Kromer B.; Hoffmann H.; Pangrazzi C.; Hublin J.-J.; Bard E.. - In: RADIOCARBON. - ISSN 0033-8222. - ELETTRONICO. - 60:2(2018), pp. 425-439. [10.1017/RDC.2017.98]
Size matters: Radiocarbon dates of <200 μg ancient collagen samples with AixMICADAS and Its Gas Ion Source
Talamo S.;
2018
Abstract
For many of archaeology's rarest and most enigmatic bone artifacts (e.g. human remains, bone ornaments, worked bone), the destruction of the 500 mg material necessary for direct accelerator mass spectrometry (AMS) dating on graphite targets would cause irreparable damage; therefore many have not been directly dated. The recently improved gas ion source of the MICADAS (MIni CArbon DAting System) offers a solution to this problem by measuring gaseous samples of 5-100 μg carbon at a level of precision not previously achieved with an AMS gas ion source. We present the results of the first comparison between routine graphite dates of ca. 1000 μg C (2-3 mg bone collagen) and dates from aliquots of gaseous samples of <100 μg C (<0.2 mg bone collagen), undertaken with the highest possible precision in mind. The experiment demonstrates the performance of the AixMICADAS in achieving reliable radiocarbon measurements from <0.2 mg collagen samples back to 40,000 14C BP. The technique has great implications for resolving chronological questions for key archaeological artifacts.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
