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A Proposal for integrating the PNAR, CIPN, and total $$gamma$$-ray techniques for the non-destructive assay of used nuclear fuel assemblies

Bolind, A.

This paper proposes to combine two neutron-based NDA techniques and one $$gamma$$-ray NDA technique, to assay used LEU and HEU fuel assemblies. The two neutron techniques are the "passive neutron albedo reactivity" technique (PNAR) and the "$$^{252}$$Cf interrogation with prompt neutron detection" technique (CIPN). The $$gamma$$-ray technique is a total $$gamma$$-ray measurement. The two neutron techniques are combined through a mathematical model, while the incorporation of the $$gamma$$-ray technique is empirical. By combining the measurements of three independent physical properties, the proposed method satisfies the requirements for a determinate solution of the isotopic content.



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