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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Kočí, Jan | Prague |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Currie, Margaret
in Cooperation with on an Cooperation-Score of 37%
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article
Progress in AMS target production in sub-milligram samples at the NERC Radiocarbon Laboratory
Abstract
. Recent progress in graphite target production for sub-milligram environmental samples in our facility is presented.We describe an optimized hydrolysis procedure now routinely used for the preparation of CO2 from inorganic samples,a new high-vacuum line dedicated to small sample processing (combining sample distillation and graphitization units),as well as a modified graphitization procedure. Although measurements of graphite targets as small as 35 µg C have beenachieved, system background and measurement uncertainties increase significantly below 150 µg C. As target lifetime canbecome critically short for targets <150 µg C, the facility currently only processes inorganic samples down to 150 µg C. Allradiocarbon measurements are made at the Scottish Universities Environmental Research Centre (SUERC) accelerator massspectrometry (AMS) facility. Sample processing and analysis are labor-intensive, taking approximately 3 times longer thansamples ≥500 µg C. The technical details of the new system, graphitization yield, fractionation introduced during the process,and the system blank are discussed in detail.