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Journal articles
Activity determination of 60Co and the importance of its beta spectrum
Abstract : The activity concentration of a $^{60}$Co solution was measured by means of two 4$\pi\beta$-$\gamma$ coincidence counting systems using a liquid scintillation counter and a proportional counter (PC) in the beta channel, respectively. Additional liquid scintillation measurements were carried out and CIEMAT/NIST efficiency tracing as well as the triple-to double coincidence ratio (TDCR) methods were applied to analyse the data. The last two methods require computed beta spectra to determine the counting efficiencies.
The results of both 4$\pi\beta$-$\gamma$ coincidence counting techniques are in very good agreement and yield a robust reference value. The initial activity concentration determined with liquid scintillation counting was found to be significantly lower than the results from 4$\pi\beta$-$\gamma$ a coincidence counting. In addition, the results from TDCR and CIEMAT/NIST show some inconsistency.
The discrepancies were resolved by applying new beta spectrum calculations for the dominant allowed beta transition of $^{60}$Co. The use of calculations which take screening effects as well as the atomic exchange effect into account leads to good agreement between all four methods; the combination of these techniques delivers an important validation of beta spectra.
Cited literature [27 references]
https://hal-cea.archives-ouvertes.fr/cea-01799862
Contributor : Léna Le Roy <>
Submitted on : Tuesday, February 11, 2020 - 10:37:15 AM
Last modification on : Wednesday, February 12, 2020 - 1:23:01 AM
Contributor : Léna Le Roy <>
Submitted on : Tuesday, February 11, 2020 - 10:37:15 AM
Last modification on : Wednesday, February 12, 2020 - 1:23:01 AM
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