The Radiogenic Isotopes and Thermal Ionization Mass Spectrometry Laboratory in Department of Earth Sciences at Dartmouth College is equipped with 2 TIMS instruments for the measurement of isotopic composition and ultratrce element abundance. These instruments include a Thermo Finiggan Triton TIMS mulitcollector instrument equipped with 8 collectors and a VG Sector TIMS. The lab is also equipped with extensive clean lab facilities for sample preapration, and column separations for sample pretreatment and purification.