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Effects of the behaviour of the proton-induced isotopes production on the analysis of ancient alloys (Articolo in rivista)

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Effects of the behaviour of the proton-induced isotopes production on the analysis of ancient alloys (Articolo in rivista) (literal)

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Alternative label

G. Pappalardo (a); A. Esposito (a,b); G.A. Cirrone (a); G. Cuttone (a); S. Garraffo (d), L. Pappalardo (a,c), F. Rizzo (a,b), F.P. Romano (a,c), S. Russo (a) (2008)
Effects of the behaviour of the proton-induced isotopes production on the analysis of ancient alloys
in Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms (Print); Elsevier, Amsterdam (Paesi Bassi)
(literal)

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G. Pappalardo (a); A. Esposito (a,b); G.A. Cirrone (a); G. Cuttone (a); S. Garraffo (d), L. Pappalardo (a,c), F. Rizzo (a,b), F.P. Romano (a,c), S. Russo (a) (literal)

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a INFN, Laboratori Nazionali del Sud, Via S.Sofia 62, I95123 Catania, Italy b Dipartimento di Fisica e Astronomia, Universita` di Catania, Via S.Sofia 64, I95123 Catania, Italy c CNR, Sezione di Catania dell'Istituto per i Beni Archeologici e Monumentali, Via Sangiuliano 262, I95124 Catania, Italy d CNR, Istituto delle Tecnologie Applicate ai Beni Culturali, Montelibretti, I00100 Roma, Italy (literal)

Titolo

Effects of the behaviour of the proton-induced isotopes production on the analysis of ancient alloys (literal)

Abstract

The present work concerns non-destructive ion beam analysis carried out by means of proton-beam-induced nuclear reactions in the 10-30 MeV energy range. We focused our attention on the yield distribution of the isotopes produced in the internal region of a metal alloy. This distribution, which defines the analytical region, displays, at incident energy of about 20 MeV in a bronze based alloy, a bell-shaped curve centred at about 600 mu m with an average width of about 400 mu m. By changing the incident proton energy it is possible to displace the above region in the interior of the metal body. It should be pointed out that if we neglect to take into account the correct behaviour of the isotope yield distribution in samples with surface inhomogeneities we can obtain erroneous analytical results. We describe some experiments based on proton activation analysis (PAA) carried out at the INFN-Laboratori Nazionali del Sud (LNS) in Catania where we verified the bell-shape of the radioactive isotope distribution. The resulting formulas are given for quantitative analysis. (literal)

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