Silver surface enrichment in ancient coins studied by micro-PIXE

The surface enrichment of archeological silver–copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used non-destructive techniques, such as particle-induced X-ray emission (PIXE) and X-ray fluorescence (XRF) are surface techniques, with penetratio...

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Published inNuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 306; pp. 241 - 244
Main Authors Ager, F.J., Moreno-Suárez, A.I., Scrivano, S., Ortega-Feliu, I., Gómez-Tubío, B., Respaldiza, M.A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2013
Subjects
Alloys
Cross sections
Enrichment
Nondestructive testing
Nuclear microprobe
PIXE
Roman
Roman silver coins
Silver
Silver enrichment
Silver–copper alloys
X-ray fluorescence
PIXE
Nuclear microprobe
Roman silver coins
Silver enrichment
Silver–copper alloys
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Abstract The surface enrichment of archeological silver–copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used non-destructive techniques, such as particle-induced X-ray emission (PIXE) and X-ray fluorescence (XRF) are surface techniques, with penetration depths typically ranging from a few microns to a few tens of microns. Therefore, these techniques could produce results which are not representative of the bulk composition of the alloy. In order to gain insight into the silver enrichment process and the effects on the data obtained with these techniques, a set of silver roman denarii were cross sectioned and analyzed at the Centro Nacional de Aceleradores micro-PIXE facility. Elemental maps show silver surface enriched layers up to 250μm thick. Besides, silver-enriched surface layers are not found for alloys with 96–98wt.% Ag.
AbstractList The surface enrichment of archeological silver-copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used non-destructive techniques, such as particle-induced X-ray emission (PIXE) and X-ray fluorescence (XRF) are surface techniques, with penetration depths typically ranging from a few microns to a few tens of microns. Therefore, these techniques could produce results which are not representative of the bulk composition of the alloy. In order to gain insight into the silver enrichment process and the effects on the data obtained with these techniques, a set of silver roman denarii were cross sectioned and analyzed at the Centro Nacional de Aceleradores micro-PIXE facility. Elemental maps show silver surface enriched layers up to 250 mu m thick. Besides, silver-enriched surface layers are not found for alloys with 96-98wt.% Ag.
The surface enrichment of archeological silver–copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used non-destructive techniques, such as particle-induced X-ray emission (PIXE) and X-ray fluorescence (XRF) are surface techniques, with penetration depths typically ranging from a few microns to a few tens of microns. Therefore, these techniques could produce results which are not representative of the bulk composition of the alloy. In order to gain insight into the silver enrichment process and the effects on the data obtained with these techniques, a set of silver roman denarii were cross sectioned and analyzed at the Centro Nacional de Aceleradores micro-PIXE facility. Elemental maps show silver surface enriched layers up to 250μm thick. Besides, silver-enriched surface layers are not found for alloys with 96–98wt.% Ag.
Author Moreno-Suárez, A.I.
Gómez-Tubío, B.
Respaldiza, M.A.
Scrivano, S.
Ager, F.J.
Ortega-Feliu, I.
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Keywords PIXE
Nuclear microprobe
Roman silver coins
Silver enrichment
Silver–copper alloys
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Snippet The surface enrichment of archeological silver–copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used...
The surface enrichment of archeological silver-copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used...
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SubjectTerms Alloys
Cross sections
Enrichment
Nondestructive testing
Nuclear microprobe
PIXE
Roman
Roman silver coins
Silver
Silver enrichment
Silver–copper alloys
X-ray fluorescence
Title Silver surface enrichment in ancient coins studied by micro-PIXE
URI https://dx.doi.org/10.1016/j.nimb.2012.12.037
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