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Science 4 November 1977:
Vol. 198. no. 4316, pp. 507 - 508
DOI: 10.1126/science.198.4316.507
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Articles

Carbon-14: Direct Detection at Natural Concentrations

D. E. NELSON 1, R. G. KORTELING 1, and W. R. STOTT 2

1 Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
2 McMaster University, Hamilton, Ontario, Canada L8S 4L8

The 14C atoms naturally present in a piece of 19th-century wood have been detected directly by means of a tandem Van de Graaff accelerator used as a high-energy mass spectrometer. The 14C ions were easily resolved from interfering ions with the use of a DgrE-E detector telescope (this telescope consists of a pair of detectors; one of them measures the specific ionization, DgrE, and the sum of the signals from both detectors gives the total energy for each ion, ET). The technique offers a number of practical advantages.

Submitted on June 29, 1977
Revised on September 15, 1977


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