Precise Measurement of Cerium and Lanthanum Isotope Ratios

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概要

• 論文の詳細を見る

• The isotope ratios of cerium and lanthanum are determined precisely by a surface ionization mass spectrometer. 138Ce/142Ce and 140Ce/142Ce ratios for Ce standard solution are 0.0225762± 0.0000014 (2σ) and 7.9471±0.0003 (2σ), normalized to 136Ce/142Ce=0.01688, respectively. 138La/139La ratio is 0.0009025±0.0000005 (2σ). The oxygen isotope ratios in measurements of REE as oxide ions are 0.0003916±0.0000014 (2σ) and 0.002129±0.000010 (2σ) for 17O/16O and 18O/16O. The isotopic abundances (%) of 136Ce, 138Ce, 140Ce and 142Ce are calculated to be 0.1878, 0.2512, 88.433 and 11.128, respectively. The isotopic abundances (%) of 138La and 139La are calculated to be 0.09016 and 99.9098. These isotopic abundances obtained here give the following relation:(138La/142Ce)ATOMIC=0.008173×(La/Ce)WEIGHT.These precise isotopic abundances on Ce and La are fundamental values in a La-Ce geochronometer.

• 日本質量分析学会の論文

著者

• Makishima Akio

  Laboratory for REE Microanalysis, Department of Chemistry, Faculty of Science, The University of Tok

• Shimizu Hiroshi

  Laboratory for REE Microanalysis, Department of Chemistry, Faculty of Science, The University of Tok

• Masuda Akimasa

  Laboratory for REE Microanalysis, Department of Chemistry, Faculty of Science, The University of Tok

関連論文

• Precise Measurement of Cerium and Lanthanum Isotope Ratios
• The New Technique for the Measurement of Isotope Abundance of 143Nd without Chemical Removal of Other Rare Earth Elements (表面電離法による同位体比測定)
• Estimation of Light Rare Earth Element Patterns in Original Sources for Rocks from Their Ce and Nd Isotopic Ratios (表面電離法による同位体比測定)
• A further examination of existence of primary technetium in nature.

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