Paper Info
Title
Bayesian Activity Estimation and Uncertainty Quantification of Spent Nuclear Fuel Using Passive Gamma Emission Tomography
Abstract
In this paper, we address the problem of activity estimation in passive gamma emission tomography (PGET) of spent nuclear fuel. Two different noise models are considered and compared, namely, the isotropic Gaussian and the Poisson noise models. The problem is formulated within a Bayesian framework as a linear inverse problem and prior distributions are assigned to the unknown model parameters. In particular, a Bernoulli-truncated Gaussian prior model is considered to promote sparse pin configurations. A Markov chain Monte Carlo (MCMC) method, based on a split and augmented Gibbs sampler, is then used to sample the posterior distribution of the unknown parameters. The proposed algorithm is first validated by simulations conducted using synthetic data, generated using the nominal models. We then consider more realistic data simulated using a bespoke simulator, whose forward model is non-linear and not available analytically. In that case, the linear models used are mis-specified and we analyse their robustness for activity estimation. The results demonstrate superior performance of the proposed approach in estimating the pin activities in different assembly patterns, in addition to being able to quantify their uncertainty measures, in comparison with existing methods.</p>
Year
DOI
Venue
2021
10.3390/jimaging7100212
JOURNAL OF IMAGING
Keywords
DocType
Volume
inverse problems, imaging, Bayesian inference, uncertainty quantification, tomography, Markov chain Monte Carlo
Journal
7
Issue
ISSN
Citations 
10
2313-433X
0
PageRank 
References 
Authors
0.34
0
7
Name
Order
Citations
PageRank
Ahmed Karam Eldaly100.34
Ming Fang200.34
Angela Di Fulvio300.34
Stephen McLaughlin400.34
Mike E Davies500.34
Yoann Altmann622922.58
Yves Wiaux719425.03