Determination of carbon contents in the iron meteorites Toluca and Algarrobo

Details Determination of carbon contents in the iron meteorites Toluca and Algarrobo Determination of carbon contents in the iron meteorites Toluca and Algarrobo

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988nimpb..30..466m&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 30, Issue 3, p. 466-469.

Physics

9

Scientific paper

The nuclear microprobe at the cyclotron of the Vrije Universiteit in Amsterdam, The Netherlands, was employed for a study of the iron meteorites Toluca and Algarrobo. Samples were irradiated with ~ 0.4 nA of 1.4 MeV deuterons. Carbon was detected by measuring the proton spectrum of the 12C(d, p)13C nuclear reaction. The X-ray spectrum of Fe and Ni was measured simultaneously. Area scans of squares approximately 1 × 1 mm2 were made with beam size approximately 20 × 20 μm2. Spots chosen for the analysis contained areas of taenite, plessite and martensite surrounded by kamacite. Our area scans show clearly that regions of martensite are more C-rich than those of plessite and taenite with lowest C intensity in kamacite. At this point it is still impossible to determine the C-concentrations absolutely with good precision due to possible C-contamination during the target preparation and/or the C-deposition on the irradiated spot during the measurement.
However, minimal concentrations of carbon in plessitic and martensitic areas were calculated assuming that all the C counts in kamacite areas come from contamination and using a Fe-C standard with 0.8% C.
Further improvements of the technique are planned, including measuring immediately after polishing samples with Al2O3, as well as employing a cold trap inside of the irradiation chamber to reduce carbon deposition during measurement.

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