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Title: | Isotopic and Elemental Composition of Boron in Meteorites, Tektites and Terrestrial Materials |
Authors: | Agyei, Kenneth Emmanuel |
Advisor: | McMullen, C. C. |
Department: | Physics |
Keywords: | Physics;Physics |
Publication Date: | Oct-1968 |
Abstract: | <p>The absolute B<sup>11</sup>/B<sup>10</sup> ratios of meteorites, tektites and terrestrial materials have been determined mass spectrometrically with a precision of 0.17 per cent (two standard errors) for one complete analysis, an accuracy of 0.05 per cent and a reproducibility of the mean of 0.08 per cent (half range).</p> <p>Separation of boron was by cyclic pyrohydrolysis and the quantity determined by curcumin colorimetry with a precision of 9 per cent (two standard deviations), an accuracy (relative to isotope dilution) of 1 per cent and a reproducibility of 5 per cent.</p> <p>The results indicate that there are no differences between the average terrestrial and meteoritic ratios. The slightly high value for Bruderheim (M) is probably due to latter-stage cosmic irradiation. Absorption of marine boron by certain clays produces a 4.8 per cent enrichment of B<sup>11</sup> in sea water. Tektites appear to have a sedimentary rather than a chondritic or igneous origin.</p> <p>Mean values of B<sup>11</sup>/B<sup>10</sup> ratios and boron content for meteorites and the planets are estimated.</p> |
URI: | http://hdl.handle.net/11375/13168 |
Identifier: | opendissertations/7993 9077 4422596 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
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fulltext.pdf | 40.84 MB | Adobe PDF | View/Open |
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