MASS SPECTROGRAPHY FOR THE ANALYSIS OF SOLIDS. (II) DETERMINATION OF THE ISOTOPIC RATIOS OF LEAD, THORIUM AND URANIUM IN MINERALS

MASS SPECTROGRAPHY FOR THE ANALYSIS OF SOLIDS. (II) DETERMINATION OF THE ISOTOPIC RATIOS OF LEAD, THORIUM AND URANIUM IN MINERALS

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 i...

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Bibliographische Detailangaben
Hauptverfasser: Makita, Tutomu, Nishiyama, Shingo, Kishi, Hiroshi, Yubuta, Yoko, Sakamoto, Sadao
Format: Report
Sprache:eng
Schlagworte:
Atomic and Molecular Physics and Spectroscopy
CHEMICAL ANALYSIS
CRYSTALS
GEOLOGIC AGE DETERMINATION
Geology, Geochemistry and Mineralogy
INTENSITY
IONS
ISOTOPES
JAPAN
LEAD(METAL)
LINE SPECTRA
MASS SPECTRA
MASS SPECTROSCOPY
MINERALS
MONAZITE
THORIUM
TRANSLATIONS
URANIUM
ZIRCON
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Beschreibung
Zusammenfassung: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 207Pb/206Pb, 238U/206Pb, 235U/207Pb and 232Th/208Pb by use of this precedure. The sources of discrepancy were discussed. (Author) Trans. of Shitsuryo Bunseki v12 n28 p223-228 1965. See also Part 1, AD-804 500.