Bayesian inference of 1D activity profiles from segmented gamma scanning of a heterogeneous radioactive waste drum

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We present a Bayesian approach to probabilistically infer vertical activity profiles within a radioactive waste drum from segmented gamma scanning (SGS) measurements. Our approach resorts to Markov chain Monte Carlo (MCMC) sampling using the state-of-the-art Hamiltonian Monte Carlo (HMC) technique and accounts for two important sources of uncertainty: the measurement uncertainty and the uncertainty in the source distribution within the drum. In addition, our efficiency model simulates the contributions of all considered segments to each count measurement. Our approach is first demonstrated with a synthetic example, after which it is used to resolve the vertical activity distribution of 5 nuclides in a real waste package.


Original languageEnglish
Article number109803
Pages (from-to)1-10
Number of pages10
JournalApplied Radiation and Isotopes
Publication statusPublished - 1 Sep 2021


  • Segmented gamma scanning (SGS), Markov chain Monte Carlo (MCMC), Source distribution uncertainty, Uncertainty quantification, Spatially-distributed inference

ID: 7157922