Quality assurance in accelerator mass spectrometry: Results from an international round-robin exercise for 10Be - Merchel, S; Bremser, W; Akhmadaliev, S; Arnold, M; Aumaître, G; Bourlès, DL; Braucher, R; Caffee, M; Christl, M; Fifield, LK; Finkel, RC; Freeman, SPHT; et al. (Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, 2012)