Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5407s&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5407
Computer Science
Scientific paper
Multicollector ICPMS has joined TIMS as a technique capable of high precision isotopic analysis of small sample volumes, typically in the range of 100 pg to 200 ng. In the case of TIMS (ThermoFinnigan TRITON), the samples for analysis have to be specially prepared and loaded onto filaments. Lateral resolution is only accessible through micro-drilling techniques. The advent of MC-ICPMS (ThermoFinnigan NEPTUNE) in combination with laser ablation, allows high throughput in-situ analysis of small samples with high spatial resolution. There are, however, analytical problems involved in the laser ablation process, as well as instrumental imperfections in the ICP ion source, the mass spectrometer and the ion detection system. With smaller sample sizes, the signal intensities decrease and the noise in the detection system joins the analytical blanks as a limiting factor for the attainable precision. The Faraday detectors typically installed in a TIMS or MC-ICPMS multicollector detector array can be used for signal intensities down to about 300.000 ions/second (5 mV @ 10e11 Ohms). At smaller count rates, detector noise becomes the limiting fact and ion counting starts to become the preferred method. However, the geometry and size of the ion counting detectors are not usually compatible with the very stringent space requirements of a variable multicollector array. Therefore, we have developed a special setup of miniaturized Multiple-Ion-Counters (MIC), which are identical in size and interchangeable with the standard Faraday detectors of the ThermoFinnigan NEPTUNE/TRITON multicollector. In total, 9 Faraday Cups plus 8 MIC channels can be installed simultaneously. The dispersion of the variable multicollector array is large enough to measure uranium isotopes on the high mass side and all Pb isotopes on the low mass side at unit mass separation in one setting. As a result, the NEPTUNE can be used with a pulsed focused UV laser beam for in situ analysis of small zircon crystals.
Bouman Claudia
Moll A.
Schwieters Johannes B.
Tuttas Dietmar
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