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MAT 261 Thermal Ionization Mass Spectrometer

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MAT 261 Thermal Ionization Mass Spectrometer


The Department of Geological Sciences has a Finnigan MAT 261 thermal ionization mass spectrometer for the measurement of isotopic compositions and elemental concentrations in the Rb-Sr, Sm-Nd, Lu-Hf, and U-Th-Pb systems, as well as measurement of the elemental concentrations of Li, B, Mg, K, Zr, and REE by isotope dilution. The mass spectrometer is equipped with seven faraday cups, which allows for both static and multidynamic mode data acquisition of signal intensities in the range of 10-15 to 10-11 amps. In addition, the mass spectrometer has been upgraded to include an ion-counting channel, which allows for the measurement of signal currents down into the 10-18 amp range. The mass spectrometer has a thirteen-sample turret with both manual and automated running capabilities. Preparation of samples for the mass spectrometer is accomplished in one of three HEPA-filtered, class 100, clean-room laboratories in the department.