Rostock 2019 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 4: Accelerator Mass Spectrometry and Applications

MS 4.1: Talk

Wednesday, March 13, 2019, 10:30–10:45, U A-Esch 2

Proof of suitability of ⁴¹Ca as a reference isotope for the characterization of reactor concrete — •R. Spanier¹, S. Heinze¹, M. Schiffer¹, A. Stolz¹, G. Hackenberg¹, S. Herb¹, L. Bussmann¹, C. Müller-Gatermann¹, A. Dewald¹, R. Magreiter², E. Strub², M. Michel², K. Eberhardt³, M. Dewald⁴, and B. Dittmann⁴ — ¹Institut für Kernphysik, Köln, Deutschland — ²Abteilung Nuklearchemie, Köln, Deutschland — ³Institut für Kernchemie, Mainz, Deutschland — ⁴Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) GmbH

In the field of nuclear waste management reference isotopes are important for the radiological characterization of the radioactive material. Often ⁶⁰Co or ¹⁵²Eu are used for this purpose as they are relatively easy to measure by means of gamma ray spectroscopy. The disadvantages are the relatively short half-lives and in the case of reactor concrete these seed materials ⁵⁹Co or ¹⁵¹Eu are contained only as trace elements and homogeneity of the seed material in a large amount of material is not guaranteed. Thus, these reference nuclides are not very well suited if longer storage and control is needed. Therefore, we investigated the suitability of ⁴¹Ca as a reference isotope for reactor concrete e.g. originating from the bio-shield of a nuclear power station. We measured ⁴¹Ca concentration of irradiated samples at the 6MV TANDETRON AMS set-up of the University of Cologne. The ⁴¹Ca was chemically extracted as CaF to produce a sputter target for the AMS measurement . We will report on the results with respect to sensitivity and precision obtained so far.