Abstract
Absolute AMS (accelerator mass spectrometry) measurements require reliable standards for calibration. Highly concentrated 26Al was obtained from NBS (National Bureau of Standards). The 26Al, SRM 4229, was sequentially diluted with natural Al and 26Al AMS standards were prepared. These 26Al AMS standards are widely used as primary standards at major AMS laboratories. A substantial amount of 26Al AMS standards with 26Al/Al ratios of 7.444×10−11, 3.096×10−11, 1.065×10−11, 4.694×10−12, 1.818×10−12 and 4.99×10−13 are now available for the AMS community. Solutions having 26Al/Al ratios between 10−12 and 10−10 were measured by several AMS laboratories; excellent linearity was obtained within the range of 5×10−13–1×10−1026Al/Al.
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