Experimental determination and geochemical modelling of retardation behaviour of radionuclides

This project of the Federal Office for Radiation Protection was coordinated by G.E.O.S.. The aim of the project was to use large-volume column experiments (diameter: 30 cm, height: 50 cm) and soils recognized by the German Federal Environment Agency for application in test procedures according to the German Federal Soil Protection Act/Ordinance to determine the most realistic KD values possible for the 9 radionuclides relevant to final disposal: Ni-63, Se-79, I-129, Cs-135, Ra-226, Np-237, Am-241, U-238 and Pu-239. The scenarios of rising groundwater due to capillary suction stress and irrigation were considered. A special GoldSimTM transport model was developed to simulate these tests, to which PHREEQC was coupled.

Services:

  • Coordination and conceptual specifications of the overall project
  • Development of a GoldSimTM simulation model for the coupled simulation of transport in the saturated and partially saturated zone, including geochemical interactions by coupling PHREEQC
  • Carrying out probabilistic sensitivity analyses on the influence of different soil parameters on the KD value
  • Model calibration and predictions for modified soil parameters

 

Auftraggeber:

Federal Office for Radiation Protection

Laufzeit:

2017-2020

Ansprechpartner bei G.E.O.S.:

Dr. René Kahnt
Tel.: +49 (0)3731 369-407
E-Mail: r.kahnt@geosfreiberg.de

  • Measurement and simulation of the transport and determination of Kd values of selected radionuclides for Refesol soils for the scenarios of irrigation and groundwater rise
  • Column test to determine the Kd value for the groundwater rise scenario
  • Comparison of the analysed and simulated Kd values for iodine-129
  • Schematic representation of the GoldSim-PHREEQC coupling