Isotope dilution-thermal ionization mass spectrometry ID-TIMS

The most common method of determining the U-Pb date of an accessory mineral is the determination of uranium and lead isotopic abundances via isotope dilution and thermal ionization mass spectrometry (ID-TIMS). Most measurements in the 1970s and 1980s required that an aliquot of the dissolved mineral solution be made, with one portion being spiked with an enriched U and ° Pb tracer solution, and the... 

In cases which require extreme accuracy and precision, isotope dilution mass spectrometry (ID-MS) may be used to measure Pb concentrations. This consists of an addition to the sample of a solution of well-known Pb concentration and isotopic composition ( spike ) followed by determination of the isotopic composition of the spiked sample using mass spectrometry, Q-ICP-MS, ICP-SMS, multi-collector ICP-MS (MC-ICP-MS), or thermal ionization mass spectrometry (TIMS). 

Notes SEM, scanning electron microscope EDS, energy-dispersive sensor TEM, transmission electron microscr y SIMS, secondary ion mass spectrometry TIMS, thermal ionization mass spectrometry ICP-MS, inductively coupled plasma mass spectrometry XRF, x-ray fluorescence ID-MS, isotope dilution mass spectrometry XRD, x-ray diffraction GC-MS, gas chromatography-mass spectrometry. 

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