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Continuous Background Originated From Neutrons By ⁶⁵Cu(p,n)⁶⁵Zn Under 4 MeV Protons — A problem on detecting trace elements in old copper alloys by PIXE

Masuchika KOHNO

Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan

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Koji YOSHIDA

Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan

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Kimikazu MORITANI

Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan

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Osamu TAKAHASHI

Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan

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Kazuyuki ENAMI

Department of Mechanical and System Engineering, Ryukoku University, Yokotani 1-5, Setaooe, Otsu 520-2194, Japan

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Toshihide UCHIDA

Department of Science of Cultural Property, Kyoto University of Art and Design, Uryuyama 2-116, Kitashirakawa, Sakyo, Kyoto 606-8271, Japan

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Fumitaka NISHIYAMA

Radiation Laboratory, Faculty of Engineering, Hiroshima University, Kagamiyama 1-4-1, Higashihiroshima, Hiroshima 739-8527, Japan

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https://doi.org/10.1142/S0129083598000212Cited by:0 (Source: Crossref)

Abstract

EDS-PIXE is a very useful and easy method for detecting trace elements in ancient materials. However, relatively high continuous background is observed, when old copper alloys are measured under 4 MeV protons. The background makes the detection limits of trace metallic elements such as Au, Ag, As, Sn, Sb and Pb in these alloys worse. The cause of the high background was investigated using a Si(Li) detector, a pure-Ge detector and a ³He neutron counter, and it was found that the continuous background level is correlated with the amount of neutron released from ⁶⁵Cu(p,n)⁶⁵Zn reaction.

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