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Appl Radiat Isot. 2014 May;87:92-4. doi: 10.1016/j.apradiso.2013.11.017. Epub 2013 Nov 18.

Update of NIST half-life results corrected for ionization chamber source-holder instability.

Author information

1
Physical Measurements Laboratory, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, MD 20899-8462, USA. Electronic address: michael.unterweger@nist.gov.
2
Physical Measurements Laboratory, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, MD 20899-8462, USA.

Abstract

As reported at the ICRM 2011, it was discovered that the source holder used for calibrations in the NIST 4πγ ionization chamber (IC) was not stable. This has affected a large number of half-life measurement results previously reported and used in compilations of nuclear data. Corrections have been made on all of the half-life data based on the assumption that the changes to the ionization chamber response were gradual. The corrections are energy dependent and therefore radionuclide specific. This presentation will review our results and present the recommended changes in half-life values and/or uncertainties.

KEYWORDS:

Calibrations; Half-life measurement; Ionization chamber

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