Preparation and Accelerator Mass Spectrometry Determination of ⁵³Mn/⁵⁵Mn Standard Reference Material

The cosmogenic isotope ⁵³Mn is a very useful tool for geochronological dating. In recent years, with the development of AMS method, the high sensitivity mearsurment for ⁵³Mn becomes advisable. High energy is required to remove the interference of ⁵³Cr in the AMS measurement of ⁵³Mn, only few AMS laboratories with high terminal voltage satisfy the condition in the world by now. In this paper, the preparation of ⁵³Mn/⁵⁵Mn laboratory standard’s series and the measurement with AMS method are introduced. In order to reduce the interference of ⁵³Cr efficiently, ΔE-Q3D method was used in AMS measurement of ⁵³Mn at China Institute of Atomic Energy (CIAE) based on the HI-13 Tandem Accelerator and the large Q3D magnetic mass spectrometer. The results show that the measured values are in good agreement with their nominal values and the linear relationship between them is excellent. The mearsurment sensitivity of 10^-14 for ⁵³Mn/⁵⁵Mn ratio can be achieved by the AMS system at China Institute of Atomic Energy (CIAE).