The new 300kV multi-nuclide AMS system at the Tono Geoscience Center, Japan Atomic Energy Agency

Full text: In the Tono Geoscience Center, Japan Atomic Energy Agency, investigation of deep underground environments for R&D program related to the geological disposal of High-Level Radioactive Waste (HLW) has been performed by using various dating systems including an AMS system. In response to the increasing demand for our AMS measurements especially from a newly established R&D program supporting development of technology for geological disposal of HLW, a state-of-the-art multi-nuclide AMS system was installed. This system is equipped with a 300 kV AMS (4103Bo-AMS), namely "JAEA-AMS-TONO- 300kV", manufactured by High Voltage Engineering, Europa B.V., Netherlands. The system has capability to measure four nuclides: carbon-14, beryllium-10, aluminium-26 and iodine-129. JAEAAMS-TONO-300kV is featuring the SO-110C ion source, a low energy spectrometer with electrostatic analyzer (ESA) and injection magnet with fast sequential isotope injection, tandem accelerator which maximum voltage is 300 kV, a high energy analyzer comprised of one ESA and two analysis magnets which degrees are 90 and 120, and an ionization chamber with a gas cell. The system footprint is 6.9 m x 5.0 m. The system structure and features, as well as the results of performance test will be presented. This installation was carried out by a contract with the Ministry of Economy, Trade and Industry of Japan as part of its R&D supporting program titled "Establishment of Advanced Technology for Evaluating the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (Fiscal Year 2020)".