AMS Measurement of ⁵³Mn at CIAE

The long-lived isotope ⁵³Mn cosmogenically produced in situ is a very useful indicator for geochronological dating. A new ⁵³Mn accelerator−mass-spectrometry (AMS) measurement method is developed based on the HI-13 Tandem Accelerator and ΔE−Q3D detection system at China Institute of Atomic Energy. The performance of ⁵³Cr isobar separation and suppression is tested by a series of ⁵³Mn standards and commercial MnO samples. The results show that the ΔE−Q3D detection system brought about an overall suppression factor of more than 10⁷ for the interfering isobar ⁵³Cr.