Hostname: page-component-7dd5485656-zklqj Total loading time: 0 Render date: 2025-10-31T08:31:21.106Z Has data issue: false hasContentIssue false
  • English
  • Français

Production of Graphite Targets by Deposition from CO/H2 for Precision Accelerator 14C Measurements

Published online by Cambridge University Press:  18 July 2016

A J T Jull ,
D J Donahue ,
A L Hatheway ,
T W Linick  and
L J Toolin
A J T Jull
Affiliation:
NSF Accelerator Facility for Radioisotope Analysis University of Arizona, Tucson, Arizona 85721
D J Donahue
Affiliation:
NSF Accelerator Facility for Radioisotope Analysis University of Arizona, Tucson, Arizona 85721
A L Hatheway
Affiliation:
NSF Accelerator Facility for Radioisotope Analysis University of Arizona, Tucson, Arizona 85721
T W Linick
Affiliation:
NSF Accelerator Facility for Radioisotope Analysis University of Arizona, Tucson, Arizona 85721
L J Toolin
Affiliation:
NSF Accelerator Facility for Radioisotope Analysis University of Arizona, Tucson, Arizona 85721
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

A method has been developed at the Arizona AMS facility for production of graphite directly from CO2 by catalytic reduction of CO/H2 mixtures. The method is a modification of procedures discussed by Vogel et al (1984). Currents of 12C− from these targets vary considerably, but have a median value which is 70% of that achieved from spectroscopic graphite. Precisions of ±60 to 100 yr are routinely achieved for 14C ages of 5000-yr-old samples containing one milligram of carbon. The yield of 14C from “blank” targets is 0.6 ± 0.1% of that from modern material.

Information

Type
I. AMS Techniques
Information
Radiocarbon , Volume 28 , Issue 2A , 1986 , pp. 191 - 197
Copyright
Copyright © The American Journal of Science 

References

Andrée, M, Beer, J, Oeschger, H, Bonani, G, Hofmann, H J, Morenzoni, E, Nessi, M, Suter, M and Wölfli, W, 1984, Target preparation for milligram-sized 14C samples and data evaluation for AMS measurements: Nuclear Instruments and Methods, v 223, no. B5, p 274–279.Google Scholar
Beukens, R P and Lee, H W, 1981, The production of small carbon samples by R F dissociation of acetylene: Symposium on Accelerator Mass Spectrometry, Proc: Argonne Natl Lab, ANL/PHY-81-1, p 416–425.Google Scholar
Boudouard, O, 1901, Recherches sur les équilibres chimiques: Annales Chimie et Physique, v 24, ser 7, p 5–85.Google Scholar
Donahue, D J, Jull, A J T and Zabel, T H, 1984, Results of radioisotope measurements at the NSF-University of Arizona tandem accelerator mass spectrometer: Nuclear Instruments and Methods, v 223, no. B5, p 162–166.Google Scholar
Donahue, D J, Jull, A J T, Zabel, T H and Damon, P E, 1983, The use of accelerators for archaeological dating: Nuclear Instruments and Methods, v 218, p 425–429.Google Scholar
Falbe, J, 1982, New syntheses with carbon monoxide: Berlin, Springer-Verlag.Google Scholar
Hoefs, J, 1980, Stable isotope geochemistry: Berlin, Springer-Verlag.CrossRefGoogle Scholar
Jull, A J T, Donahue, D J and Zabel, T H, 1983, Target preparation for radiocarbon dating by tandem accelerator mass spectrometry: Nuclear Instruments and Methods, v 218, p 509–514.Google Scholar
Olsson, R G and Turkdogan, E T, 1974, Catalytic effect of iron on decompostion of carbon monoxide. II. Effect of additions of H2, H2O, CO2, SO2 and H2S: Metall Trans, v 5, p 21–26.CrossRefGoogle Scholar
Oya, A and Marsh, H J, 1982, Phenomena of catalytic graphitization: Jour Materials Sci, v 17, p 309–322.Google Scholar
Rubin, M, Mysen, B O and Polach, H, 1984, Graphite sample preparation for AMS in a high pressure and temperature press: Nuclear Instruments and Methods, v 223, no. B5, p 272–273.CrossRefGoogle Scholar
Stuiver, M, 1982, A high-precision calibration of the AD radiocarbon time scale: Radiocarbon, v 24, p 1–26.Google Scholar
Turkdogan, E T and Vinters, J V, 1974, Catalytic effect of iron on decomposition of carbon monoxide: I. Carbon deposition in H2-CO mixtures: Metall Trans, v 5, p 11–20.Google Scholar
Vogel, J S, Southon, J R, Nelson, D E and Brown, T A, 1984, Performance of catalytically condensed carbon for use in accelerator mass spectrometry: Nuclear Instruments and Methods, v 223, no. B5, p 289–293.Google Scholar
Wagman, D D, Kilpatrick, J E, Taylor, W J, Pitzer, K S and Rossini, F D, 1945, Heats, free energies, and equilibrium constants of some reactions involving D2, H2, H2O, C, CO, CO2 and CH4 : Jour Research Natl Bur Standards, v 34, p 143–161.Google Scholar
Walker, P L, McKinstry, H A and Pustinger, J V, 1954, X-ray diffraction studies on carbon gasification: Indus Eng Chemistry, v 46, p 1651–1658.Google Scholar
Walker, P L Jr, Rakaszawski, J F and Imperial, G R, 1959, Carbon formation from carbon monoxide-hydrogen mixtures over iron catalysts. I. Properties of carbon formed: Jour Phys Chemistry, v 53, p 133–140.CrossRefGoogle Scholar
Wand, J O, Gillespie, R and Hedges, R E M, 1984, Sample preparation for accelerator-based radiocarbon dating: Jour Archaeol Sci, v 11, p 159–163.Google Scholar
Wolfli, W, Polach, H A and Anderson, H H, 1984, eds, Internatl symposium on accelerator mass spectrometry, 3rd, Proc: Nuclear Instruments and Methods, v 223, no. B5, p 91.Google Scholar