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The Mn-53-Cr-53 System in CAIs: An UpdateHigh precision techniques have been developed for the measurement of Cr isotopes on the Triton mass spectrometer, at JPL. It is clear that multiple Faraday cup, simultaneous ion collection may reduce the uncertainty of isotope ratios relative to single Faraday cup ion collection, by the elimination of uncertainties from ion beam instabilities (since ion beam intensities for single cup collection are interpolated in time to calculate isotope ratios), and due to a greatly increased data collection duty cycle, for simultaneous ion collection. Efforts to measure Cr by simultaneous ion collection have not been successful in the past. Determinations on Cr-50-54Cr, by simultaneous ion collection on the Finnigan/ MAT 262 instrument at Caltech, resulted in large variations in extrinsic precision, for normal Cr, of up to 1% in Cr-53/Cr-52 (data corrected for mass fractionation, using Cr-50/Cr-52).
Document ID
20050173932
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Papanastassiou, D. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J.
(California Inst. of Tech. Pasadena, CA, United States)
Bogdanovski, O.
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Publication Information
Publication: Lunar and Planetary Science XXXVI, Part 16
Subject Category
Geosciences (General)
Funding Number(s)
PROJECT: RTOP 344-31-55-01
Distribution Limits
Public
Copyright
Public Use Permitted.
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