2 ALLIANCE Refresher courses

 

1 hour courses (08:00-09:00 a.m.); days to be determined.

Free of charge. You can subscribe to it in the registration form.

 

1st course : “Process and data identification in models for the cycling of radionuclides in forests” Jordi Vives i Batlle. SCK•CEN. Mol, Belgium. 

This refresher course deals with modelling of radionuclide cycling in forests. Using a dynamic, process-based model of the soil – vegetation – atmosphere interactions (ECOFOR) as an example, we describe the key processes involved in the migration of radionuclides from the unsaturated zone to tree roots as well as the role of trees as biological pumps cycling radionuclides between the soil and the atmosphere. Simplified equations are proposed for the key dynamic processes, beginning with a basic representation of the hydrology (water infiltration and capillary flow, groundwater recharge, ‘tipping-bucket‘ modelling). Then, we move on to describe plant transport (uptake via roots, xylem/phloem upflow and downflow, evapotranspiration, interception, washout, leaching and litterfall). Next, we explain the link of radionuclide fluxes to water fluxes (retardation, Kd, selectivity coefficients, competition between radionuclides and stable elements). Throughout, information is given on how to make simplifications to the process equations to achieve a practical model with a minimum number of parameters, and the problems arising in doing so. Finally, we discuss parameter requirements, the link between model parameters and experimental measurements, the calibration of the model with field data and the uncertainty sources in the model.

 

2nd course : “Human and biota integrated dose assessments: CROMERICA”. Juan Carlos Mora. CIEMAT. Madrid, Spain.

This course will be focused in the use of the code CROMERICA, showing additionally the process of development of the code. Two codes: CROM 8 and CROMERICA will be used within the course. Both codes implement radioecology transport and transfer models described basically in the IAEA’s Safety Report Series No 19 document. These models are commonly used for the calculation of concentrations in the different compartments of the environment affected by routine discharges from radioactive or nuclear installations. They both implement the data needed for effective dose assessments (e.g. dose conversion factors for humans) for 163 radionuclides and for absorbed dose for biota (dose conversion factors or occupancy factors) for 63 radionuclides. Specifically for the biota, concentrations in the environment can be calculated or introduced using measured values from experiments. Several examples, taken from hypothetical and real cases, will be used for demonstrating the use of both codes for achieving integrated dose assessments for humans and the environment (biota) as required by international recommendations. (References: STAR (Contract Number: Fission-2010-3.5.1-269672) DELIVERABLE (D-N°3.1) Generic model for combined Tier-1 assessments for humans and wildlife. 2015. )

 

 

 

 

 

 

 

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