Development of 36Cl standards for AMS

Large-quantity dilutions of the National Institute of Standards and Technology (NIST) 36Cl standard (SRM 4943) to 36ClCl ratios of 5.000 × 10−13, 1.600 × 10−12, 5.003 × 10−12 and 1.000 × 10−11 have been prepared for AMS standards. Dilutions were made with an estimated uncertainty better than 1% and were then checked in three separate runs using the AMS facility at the University of Rochester. The results show excellent agreement between the gravimetric dilution factors and AMS measurements.