REASSESSMENT OF UNCERTAINTY EXPANSION BY LINEAR ADDITION OF LONG-TERM COMPONENTS FROM TOP-DOWN INFORMATION

ABSTRACT Since radiocarbon accelerator mass spectrometry ( 14 C AMS) is considered a high-precision technique, reassessment of the measurement uncertainty has been topic interest. Scientists from analytical and metrological fields have developed top-down bottom-up approaches. The quoted error should approximate long-term repetitions approach in order to be realistic. novelty this paper that both approaches were approximated each other. Furthermore, we apportioned graphitization, instrumentation, bias components additively expand error. Our results are comparable multipliers repeatability studies reported by other laboratories. laboratory was established late 2012 with N 2 as stripper gas 7 years later, changed helium stripper. Thus, able compare gases, demonstrate better gas. In absolute F units, ranges graphitization+bias combined uncertainties (0.7 4.1) × 10 –3 for (0.7–3.0) He depending on standard content. multiplier defined expanded over error, average, 1.7; while without bias, 1.3.