Preparation and Accelerator Mass Spectrometry Determination of ~(10)Be/~9Be Standard Reference Material

By dilution of ~(10)Be reference material(SRM 4235) with natural beryllium,the ~(10)Be/~(9)Be standard samples were prepared to be used as AMS standard.4 ~(10)Be/~(9)Be samples with n(~(10)Be)/n(~(9)Be) range from 2.68×10~(-11) to 2.38×10~(-12) were checked by AMS at the HI-13 tandem in CIAE.The measured results show the excellent linear relationship between measured values and respective nominal values for ~(10)Be/~(9)Be standard samples.Moreover,normalized measured values are in good agreement with their nominal values.The prepared ~(10)Be/~(9)Be standard samples can be used for accurate AMS measurements of environmental ~(10)Be/~(9)Be.