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Isotopic Analyses via MC-ICPMS and HR-ICPMS at the LAMONT DOHERTY EARTH OBSERVATORY - AMERICAN MUSEUM OF NATURAL HISTORY ICPMS LAB |
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The Neptune Plus is equipped with 10 faraday cups and 5 multipliers. The multipliers are in the axial position, attached to the high and low faraday cups as well as two additional multipliers for measuring Pb isotopes. It has 7 10^-11 amplifiers with a maximum signal range of 50V and 3 10^-12 amplifiers witha maximum signal range of 5V. |
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The Neptune was installed in 2012 under the direction of Dr. Steve Goldstein. It is currently used primarily for Sr, Nd, Hf, Pb. The Neptune has also been utilized for U-Th isotopic analyses. All these samples have been processed through the appropriate separatory columns prior to analysis. Laser ablation of zircons for Hf, and micas for Li and B have also been performed on our Neptune. |
The Attom is a magnetic sector high resolution ICPMS. It is used for isotopic analyses which have low abundances and therefore must be measured on multipliers rather than faraday cups. The multiplier has a intensity range of 10^0 to 5 x 10^6 cps (counts per second). It also has an attenuation mode that allows up to 10^9 cps measured for even larger isotopic ratio ranges. |
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The Attom was installed in November 2009, under the direction of Dr. Terry Plank. It has been used to measure Re isotopes. |