A reference material for evaluation of 137Cs radiochronometric measurements
| Autor: | Kevin P. Carney, Richard M. Essex, Jeffrey T. Cessna, Kevin B. Lavelle, Cole R. Hexel |
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| Rok vydání: | 2018 |
| Předmět: |
Molality
Radiogenic nuclide Health Toxicology and Mutagenesis Radioactive source Nuclear forensics Radiochemistry Public Health Environmental and Occupational Health 02 engineering and technology Isotope dilution 021001 nanoscience & nanotechnology 010403 inorganic & nuclear chemistry Mass spectrometry 01 natural sciences Pollution 0104 chemical sciences Analytical Chemistry Nuclear Energy and Engineering Reference values Ionization chamber Environmental science Radiology Nuclear Medicine and imaging 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 318:195-208 |
| ISSN: | 1588-2780 0236-5731 |
| Popis: | A new nuclear forensic reference material has been characterized as a standard for radiochronometric determination of the model purification date for 137Cs sources. The purification date of a radioactive source is a potentially diagnostic nuclear forensic signature for determining the provenance of a radioactive material. Reference values have been measured for the attributes needed to use the 137Cs/137Ba chronometer: the molality (reported here as nmol g-1) of 137Cs and of the radiogenic portion of 137Ba in the material (hereafter referred to as 137Ba*). All measurement results were decay-corrected to represent the composition of the material on the reference date of July 7, 2011. The molality of 137Cs is (0.7915 ± 0.0073) nmol g-1; this value was calculated from the massic activity of 137Cs, (348.4 ± 3.0) kBq g-1, as measured in the NIST 4π-γ secondary standard ionization chamber (previously calibrated by 4π-(e+x)-γ-coincidence efficiency extrapolation counting) and the evaluated half-life of 137Cs, (30.05 ± 0.08) years. The molality of 137Ba*, (1.546 ± 0.024) nmol g-1, was measured by isotope dilution mass spectrometry using the measured relative proportion of 138Ba in the material to apply a correction for the 137Ba contribution from natural Ba. A model age of (47.04 ± 0.56) years, corresponding to a model purification date of June 22, 1964 with an expanded uncertainty of 200 days is calculated from the reference material values. This age is consistent with the date engraved on the capsule that contained the 137Cs starting material and with a prior independent determination of the model purification date. A full discussion of the uncertainties of the reference material values is included. |
| Databáze: | OpenAIRE |
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