The French accelerator mass spectrometry facility ASTER after 4Â years: Status and recent developments on 36Cl and 129I

► Yearly sample throughput as high as over 3300 unknowns for 10Be in 2010. ► 35Cl/37Cl samples proved time dependent mass fractionation and/or source memory. ► Need for improvement in measurement strategies, data evaluation and ion sources. ► Cross-calibration of secondary in-house 129I standards vs. NIST 3231. ► Cross-contamination for iodine ∼0.5% within first 20 h of source running.