MASS SPECTROGRAPHY FOR THE ANALYSIS OF SOLIDS. (II) DETERMINATION OF THE ISOTOPIC RATIOS OF LEAD, THORIUM AND URANIUM IN MINERALS.
EMMANUEL COLL BOSTON MA ORIENTAL SCIENCE RESEARCH LIBRARY
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The isotopic ratios of lead, thorium and uranium in minerals were determined by vacuum spark mass spectrography. The advantages of this procedure are as follows no chemical separation is necessary the size of the mineral for analysis can be very small and the isotopes of interest can be examined in situ. Good agreement was found on preliminary dating by 207Pb206Pb, 238U206Pb, 235U207Pb and 232Th208Pb by use of this precedure. The sources of discrepancy were discussed. Author
- Geology, Geochemistry and Mineralogy
- Atomic and Molecular Physics and Spectroscopy