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- W149214489 abstract "This component of the Advanced Nuclear Measurements LDRD-PD has focused on the analysis and methodologies to quantify and characterize existing inventories of weapons and commercial fissile materials, as well as to, anticipate future forms and quantities to fissile materials. Historically, domestic safeguards had been applied to either pure uniform homogeneous material or to well characterized materials. The future is different simplistically, measurement challenges will be associated with the materials recovered from dismantled nuclear weapons in the US and Russia subject to disposition, the residues and wastes left over from the weapons production process, and from the existing and growing inventory of materials in commercial/civilian programs. Nuclear measurement issues for the fissile materials coming from these sources are associated with homogeneity, purity, and matrix effects. Specifically, these difficult-to-measure fissile materials are heterogeneous, impure, and embedded in highly shielding non-uniform matrices. Currently, each of these effects creates problems for radiation-based assay and it is impossible to measure material that has a combination of all these effects. Nuclear materials control and measurement is a dynamic problem requiring a predictive capability. This component has been tasked with helping select which future problems are the most important to target, during the last year accomplishments include: characterization of weapons waste fissile materials, identification of measurement problem areas, defining instrument requirements, and characterization of commercial fissile materials. A discussion of accomplishments in each of these areas is presented." @default.
- W149214489 created "2016-06-24" @default.
- W149214489 creator A5074471328 @default.
- W149214489 date "1999-02-01" @default.
- W149214489 modified "2023-09-25" @default.
- W149214489 title "Advanced nuclear measurements LDRD -- Sensitivity analysis" @default.
- W149214489 doi "https://doi.org/10.2172/314104" @default.
- W149214489 hasPublicationYear "1999" @default.
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