@article {845, title = {Comparative-Study of Fe-C Bead and Graphite Target Performance with the National-Ocean-Science-Ams (Nosams) Facility Recombinator Ion-Source}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {92}, year = {1994}, note = {Nv547Times Cited:23Cited References Count:13}, month = {Jun}, pages = {166-171}, abstract = {An accelerator mass spectrometry (AMS) experiment was designed to investigate C-14 target performance for two target types over a range of isotopic concentrations and sample sizes, with a special focus on the ability to measure C-14 in environmental samples having only microgram amounts of carbon. The findings were positive, showing that precision, accuracy, and stability were adequate to determine C-14 to 1\% or better in samples containing as little as 25 mug carbon. Satisfactory Poisson uncertainty and target stability were demonstrated down to a level of 7 mug carbon, but experimental data showed that accurate measurements at that level require detailed knowledge of blank variability and mass dependence of the modern carbon calibration factor.}, issn = {0168-583x}, doi = {10.1016/0168-583x(94)95999-4}, author = {Klinedinst, D. B. and McNichol, A. P. and Currie, L. A. and Schneider, R. J. and Klouda, G. A. and vonReden, K. F. and Verkouteren, R. M. and Jones, G. A.} }