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. 1997 Jul-Aug;102(4):455–477. doi: 10.6028/jres.102.031

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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. 4 — Assumed measurement model for 4πβ LS spectrometry of ⁶³Ni using ³H-standard efficiency tracing as given by the CIEMAT/NIST method. The component uncertainties are identified by u_i and s_i and correspond to the values reported in Table 3.