Rostock 2019 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 4: Accelerator Mass Spectrometry and Applications
MS 4.2: Talk
Wednesday, March 13, 2019, 10:45–11:00, U A-Esch 2
AMS measurement of 14C concentration in reactor concrete — •A. Stolz1, S. Heinze1, M. Schiffer1, C. Müller-Gatermann1, G. Hackenberg1, S. Herb1, L. Bussmann1, R. Spanier1, 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 14C plays an important role. So far 14C is measured with the liquid scintillation technique (LS) for which chemical treatment of the sample material is needed. The detection limit for 14C reached with the LS technique is limited to 1Bq/g when almost no background from other beta decaying isotopes is present. The AMS technique offers here a much higher sensitivity which becomes crucial in the future since the activity of the clearance levels for the release of material from regulatory control has been reduced from 1Bq/g to 0.1Bq/g. It appears that also the effort for a 14C measurement is much reduced with AMS since no pre-treatment is needed. Especially in the case of reactor concrete origination e.g. from the bio-shield of a nuclear power plant the sample material can be directly burned in an Elemental Analyzer (EA) and the extracted CO2 gas can be delivered to the AMS system. In this way automated measuring procedures became feasible with a high throughput and a cost reduction compared to the so far established measuring technique. We will report on first measurements and discuss the results .