The AMS facility at Lawrence Livermore National Laboratory (LLNL) routinely measures the isotopes 3H, 7Be, 10Be, 14C, 26Al, 36Cl, 41Ca, and 129I. During the past two years, over 30000 research samples have been measured. Of these samples, approximately 30% were for 14C bioscience tracer studies, 45% were 14C
samples for archaeology and the geosciences, and the other isotopes
constitute the remaining 25%. During the past two years at LLNL, a
significant amount of work has gone into the development of the
Projectile X-ray AMS (PXAMS) technique. PXAMS uses induced
characteristic X-rays to discriminate against competing atomic isobars.
PXAMS has been most fully developed for 63Ni but shows promise for the measurement of several other long lived isotopes. During the past year LLNL has also conducted an 129I interlaboratory comparison exercise.
hardware changes at the LLNL AMS facility include the installation and
testing of a new thermal emission ion source, a new multi-anode gas
ionization detector for general AMS use, re-alignment of the vacuum tank
of the first of the two magnets that make up the high energy
spectrometer, and a new cryo-vacuum system for the AMS ion source. In
addition, we have begun design studies and carried out tests for a new
high-resolution injector and a new beamline for heavy element AMS.