Status of the "new" AMS facility in Trondheim

The Radiocarbon Laboratory of the Norwegian University of Science and Technology (NTNU) in Trondheim has a long history, dating back to the 1950s. Its relatively new AMS facility is based on a 1 MV Tandetron from High Voltage Engineering Europa B.V. that is equipped with a hybrid solid/gas SO-110 ion source, a low energy spectrometer supporting sequential injection, a high energy analysis system consisting of a magnet and an electrostatic deflector, allowing insertion of an absorber foil for isobar suppression, and a two dimensional gas ionisation detector (E and Delta E). The system is at present capable of measuring Be-10, C-14, and Al-26 and can be easily modified to measure isotopes of higher masses. Acceptance tests results for Be-10(1+), C-14(2+), Al-26(3+) are presented. The laboratory measures only C-14 at present and the routine procedures are described. The system has demonstrated a very low background (70,000 C-14 years BP or 2.10(-16) on Alfa Aesar 40795 graphite powder, -200 mesh, 99.9995%) for C-14 when charge state 2+ is measured and the interference of Li ions in the detector is minimal. Some ion optical peculiarities of the system are also discussed. (C) 2015 Elsevier B.V. All rights reserved.