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Characterisation of metallic powder impregnated pastes using polychromatic X-radiography

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This article reports on the employment of X-radiography using the bremsstrahlung of a commercial broad-spectrum X-ray source to quantify the differences and relationships between complex materials of unknown composition. The materials examined were metallic powders embedded in a carrier paste. The resulting pseudo-signatures are transmission spectra over a range from 15 to 75 kV taken at 1 kV intervals, which were extracted from stacks of registered, field-flattened images. It is shown that it is possible to quantify differences between transmission spectra in order to differentiate between metallic powders used to impregnate the carrier paste.
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Keywords: Forensic; X-ray absorption; X-ray imaging; grey level; liquids; non-destructive testing; pastes

Document Type: Research Article

Affiliations: 1 Institute for the Environment, Physical Sciences and Applied Mathematics, Keele University, Staffordshire ST5 5BG, UK.

Publication date: October 1, 2008

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