Status report of multi-nuclide AMS and applied research by the 6 MV tandem accelerator mass spectrometry system at the University of Tsukuba

The Tsukuba 6 MV AMS system for multi-nuclide measurements has been successfully established and operated at the University of Tsukuba since 2016. We improved detection conditions for each nuclides in the first year operation. Long-lived radionuclides of ¹⁰Be, ¹⁴C (graphite and CO₂), ²⁶Al, ³⁶Cl, ⁴¹Ca and ¹²⁹I have been detected with a five-anode ΔE–E gas ionization detector in the range of isotope ratios from 10^-10 to 10^-15. The result of AMS performances achieved by the Tsukuba 6 MV AMS system is entirely satisfactory to measure cosmogenic nuclides for applications of earth environmental research field. The total number of samples was 1,120 for AMS during the first year operation in 2016. In this paper, we report multi-nuclide AMS performances and applications for the Tsukuba 6 MV AMS system. (author)