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Impressive Data from 2011 US Phoenix Installations

Posted on 17th November, 2011

TIMS produces absolute isotope ratio values rather than values normalized to a standard as is usual in gas IRMS. There is however always a small difference from machine to machine which explains why although modern TIMS systems can achieve a measurement precision of  less than 5ppm, accuracy specifications are usually of the order of 25 or 30 ppm. Nevertheless we would expect instruments made in the same factory within a few...

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New Application Note: 87Sr/86Sr of sub 10ng loads of NBS987

Posted on 27th September, 2011

Sub-millimeter variations in Sr isotope ratios across zoned minerals and in fluid inclusions continue to be of interest to geologists. Whilst the use of ion microprobe systems provide the best spatial resolution, TIMS coupled with micro-milling devices provide the best accuracy and precision.  Sample sizes are small – perhaps only a nanograms of Sr –...

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New Application Note – Total evaporation (TE) of 500ng U500 using Phoenix TIMS

Posted on 16th September, 2011

High sensitivity measurements of U are of crucial importance in a number of fields. Whilst atom/ion efficiency of >1% has been achieved for point source methods using carbon, for analyses of larger U loads (~500 ng) using a standard filament assembly with no carbon the typical atom/ion efficiency is in the range 0.005% to 0.01%. To test the ionization efficiency and precision achievable...

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New application note on the downloads page – High precision Os isotope ratio measurements using Phoenix X62 TIMS.

Posted on 29th July, 2011

A high precision Os note has been added to the downloads page. The wide interest in using Re/Os and Pt/Os in geochemistry and cosmochemistry make this a particularly important application. Phoenix includes a number of new developmental which significantly improve the negative ion performance compared to older generation machines. The application note provides the first detailed indication on the performance of the Phoenix system for Os and...

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New Technical Note – Analysis of very large isotope ratios (236U/238U in IRMM184)

Posted on 24th January, 2011

A new technical note (G30111) describing the analysis of 236U/238U in the SRM IRMM184 has been added to the downloads page.

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