Radiocarbon applications in cosmochemistry and biomedical tracing
Accelerator-based radiocarbon analysis of Antarctic H chondrites has allowed terrestrial age determinations which confirm prior pairing determinations. The analyzed meteorites constitute several individual meteorites; one group with average terrestrial ages of 28.2 ± 0.8 ka; and two additional grou...
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| Format: | Text |
| Language: | English |
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Purdue University
2001
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| Online Access: | https://docs.lib.purdue.edu/dissertations/AAI3043733 |
| Summary: | Accelerator-based radiocarbon analysis of Antarctic H chondrites has allowed terrestrial age determinations which confirm prior pairing determinations. The analyzed meteorites constitute several individual meteorites; one group with average terrestrial ages of 28.2 ± 0.8 ka; and two additional groups with similarly young average terrestrial ages of 1.7 ± 0.7 ka (or <3.1 ka) and 2.0 ± 1.0 ka (or <4.0 ka). Our results hint at preterrestrial juxtaposition of large-scale solar gas-rich and gas-free regions and indicate that regions of very high and low natural thermoluminescence may have existed on the same meteoroid. Biomedical sample handling and carbon isotope dilution for accelerator-based radiocarbon analysis are presented: the combination allows rapid determination of specific 14C activity in highly active (15,000 times modern) or very small (<5μmol carbon) biomedical samples. The key advantage of the method lies in simultaneous determination of both total carbon and 14C, optimizing throughput and avoiding contamination in processing and measurement. |
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