An overview of geostatistics for radiological characterization

Find out why the geostatistical approach is relevant for radiological characterization, what its added value and application conditions are.

Objective

This one-day seminar presents the added value of geostatistics for radiological characterization of nuclear facilities under decommissioning and contaminated sites, taking into account site history, sampling optimization, in-situ radiation mapping, and contaminated volume classification.

Key points

Methodological exposition illustrated in the field of site clean-up/dismantling on numerous cases of application. Added-value of the geostatistical methodology as well as its limits of use. Feedback and discussions.

Who should attend?

This course is aimed at project managers and decision-makers involved in decommissioning and dismantling projects who want a practical, synthetic, and pragmatic introduction to geostatistical methods for radiological characterization.

Course content

Understanding and estimating the spatial heterogeneity of contamination

  • Pros/Cons and underlying assumptions of the usual approaches for radiological characterization
  • A practical introduction to the concepts of heterogeneity and spatial variability of pollutants (variogram)
  • Operational consequences on the feasibility of given remediation techniques.

Predicting and mapping radiological contamination

  • Introduction to kriging and its advantages taking into account spatial variability, best estimation, quantification of associated uncertainty
  • Consideration of ancillary information: site history, qualitative observations, and on-site measurements.

Quantify and locate contaminated volumes

  • A practical introduction to stochastic simulations
  • Presentation of results: global estimation of contaminated volumes and attached uncertainty, local risk of exceeding cleanup levels.

Recommendations for the optimization of site investigation plans

  • Implementation of the triptych: Evaluation objective – Sampling strategy – Data processing
  • Feedback on the spatial structures of radiological contamination
  • Impact on uncertainties with the degradation of sampling or multivariate treatment

Prerequisites

None

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