期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 11, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2010GC003198
关键词
zircon; geochronology; LA-ICP-MS; detector linearity
资金
- American Chemical Society
- State of Texas Norman Hackerman Advanced Research Program
- NSF/IF [0824967]
- NASA [NNX09AC06G]
- Directorate For Geosciences
- Division Of Earth Sciences [0824967] Funding Source: National Science Foundation
- NASA [NNX09AC06G, 120816] Funding Source: Federal RePORTER
Element concentration and isotope ratio measurements by single-collector mass spectrometry often require the detection system to handle ion beams with very large intensity ratios. In order to obtain accurate and reproducible element concentration and isotope ratio data, the detection system must have a linear response with respect to the intensity of the incident ion beam. An extended range scaling pulse counting detector equipped on a Varian 810 quadrupole inductively coupled plasma-mass spectrometer (ICP-MS) was tested for linearity across count rates of similar to 2000 to 110,000,000 cps with different concentrations of natural U solutions. We also tested detector linearity by the laser ablation analysis of Pb-206/U-238, Pb-207/U-235, and Pb-207/Pb-206 ratios in well-characterized 416-1565 Ma zircon standards. Results indicate that there is no correlation between the measured isotope ratio and ion intensity for the solution tests or the tests of natural zircon standards. The results of these tests confirm the suitability of this instrument for isotope ratio measurements that require a substantial dynamic range without having to switch between pulse counting and analog modes on electron multipliers or switching between electron multiplier to Faraday detectors.
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