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In the framework of the development of prediction tools to be used in the field of non-destructive analysis (NDA) for nuclear safeguards, a need was expressed for space-energy-time dependent models. Existing mathematical models for predicting the space-energy-time behaviour of fission neutrons use point models borrowed from reactor physics. The point model approximation, sufficiently accurate for predicting neutron behaviour in homogeneous, well characterised samples, is definitely badly representing the space-energy-time structure when samples are more structured in geometry and homogeneity. This is creating increasing problems for the prediction of the real coincidences in safeguards assay prediction, and more advanced tools partitioning reality in a discrete way rather than coarse partition tools are requested. The state variation of the obtained multi-nodal system can be described using the Kolmogorov approach for time-invariant markov chains. In the paper, the basic methodology will be defined. The resulting formalism will be developed in the field of synchronised source processes. Following the results of the synchronised case, the Poissonian distributed source case is studied.

Additional information

Authors: MARSEGUERRA M, Politecnico di Milano, Dipartimento di Ingegnaria Nucleare (IT);NONNEMAN S, JRC Ispra (IT)
Bibliographic Reference: Paper presented: ESARDA 19th Symposium on Safeguards, Montpellier (FR), May 13-15, 1997
Availability: Available from (1) as Paper EN 40616 ORA
Record Number: 199711094 / Last updated on: 1997-09-16
Original language: en
Available languages: en
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