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. 2004 Apr 1;109(2):185–217. doi: 10.6028/jres.109.013

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 2 — Graphical representation of the production, distribution, and decay of natural ¹⁴C (courtesy of D. J. Donahue).(Parameter values are approximate.)