Age determination of a 75Se gamma radiography source for nuclear forensics.

Autor: McLain, Derek R., Brossard, Tom W., Tsai, Yifen, Condon, Nicholas J., Canaday, Jodi L.
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Zdroj: Journal of Radioanalytical & Nuclear Chemistry; May2022, Vol. 331 Issue 5, p2169-2174, 6p, 2 Charts, 4 Graphs
Abstrakt: Two methods were used to evaluate the age of 75Se sealed source material. Both methods utilized gamma spectroscopy to determine the quantity of parent 75Se present, but they differed in the technique used to determine the quantity of daughter 75As. In one method, 75As was quantified using inductively coupled plasma-mass spectrometry (ICP-MS) after using chromatographic techniques to separate the parent and daughter isotopes. In the other method, total As was measured using optical emission spectroscopy (OES), which did not require separation prior to measurement. The OES method was faster and gave slightly lower uncertainties, but required more daughter material to be present because of higher concentration requirements, making it unsuitable for young material. Both methods are hampered by the monoisotopic nature of As, but still gave reasonable model ages that were in agreement with each other. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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