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. 2013 Aug 15;118:359–374. doi: 10.6028/jres.118.017

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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 — Experimentally-determined calibration factors, K, as a function of source volume for the NIST Vinten 671 ionization chamber (VIC) for the solution-filled ¹³³Ba cylinders used in this study. The uncertainty bars correspond to a single uncertainty interval (k = 1) calculated as described in Sec. 3.3. The line through the data is intended only to guide the eye.