Development of small CO2 gas measurements with AixMICADAS

[摘要] After three years of tests and developments, the performances of the AixMICADAS facility have been established for small CO2 samples with a carbon mass inferior to 100 mu g. The instrument shows very good stability and reliability when measuring small samples with its gas ion source. In this configuration, the precision is mainly limited by counting statistics and also the accuracy by contamination effects for the smallest samples (< 20 mu gC). A long term variability of 7-8 parts per thousand is evaluated with 80-100 mu gC NIST oxalic acid 2 samples and modern carbonate samples. Our pretreatment and analytical protocols allow for very low blank levels corresponding to C-14 ages of 53,000 years BP and 48,000 years BP for carbonate samples and organic materials, respectively.

[发布日期] 2018-12-15

[关键词] AMS;Radiocarbon;Gas ion source;Small samples