Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994nimpb..92..505c&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section B, Volume 92, Issue 1-4, p. 505-509.
Physics
Scientific paper
Step-wise heating and differential cryogenic trapping techniques are used to distinguish different sources of 14C associated with meteorites. Basing the temperature steps on mass pyrogams, three aliquots of carbon-rich gas are evolved: contamination below 450°C terrestrial weathering products between 450 and 850°C and the spallation component is liberated from the melt. CO and CO2 are the dominant species evolved, and are separated for each temperature fraction using a variable temperature trap, with CO subsequently oxidized and trapped as CO2. 14C is preferentially released as CO for the spallation component, yielding CO/(CO + CO2) ratios varying between 0.60 and 0.85. The hope that a clean separation of spallation 14C by measurement of only the CO component was not borne out, though the CO fraction does appear to suffer less from contemporary, terrestrial contamination than the CO2 fraction.
Beukens Roelf P.
Cresswell Richard G.
Miúra Yasunori
Rucklidge John C.
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