Title: Morphological and compositional study of 238U thin film targets for nuclear experiments
Authors: SIBBENS GOEDELEERNSTBERGER MARKUSGOUDER THOMASMAROULI MARIAMOENS ANDRESEIBERT ALICEVANLEEUW DAVIDVARGAS ZUNIGA MARTINWISS THIERRYZAMPELLA MARIAVITTORIAZULEGER EVELYN
Citation: AIP CONFERENCE PROCEEDINGS vol. 1962 p. 030007
Publisher: AMERICAN INSTITUTE OF PHYSICS
Publication Year: 2018
JRC N°: JRC104427
ISSN: 0094-243X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC104427
DOI: 10.1063/1.5035524
Type: Articles in periodicals and books
Abstract: The uncertainty in neutron cross section values strongly depends on the quality and characteristics of the deposited actinide films which are used as “targets” in the nuclear experiments. Until recently, at the Joint Research Centre in Geel (JRC-Geel), mass and areal densities of actinide layers were determined by measuring activity (using alpha-particle counting), isotopic composition (using thermal ionisation mass spectrometry) and diameter. In this study a series of 238U deposits, prepared by molecular plating and vacuum deposition on different substrates, were characterized with additional non-destructive and destructive analysis techniques. The quality of the deposits was investigated by autoradiography, high-resolution alpha-particle spectrometry, and scanning electron microscopy. The elemental composition was determined by x-ray photoelectron spectroscopy and inductively coupled plasma mass spectrometry. The latter technique was also applied on the U3O8 starting material and the converted UF4 powder. This paper compares the quality and morphology of deposited 238U films prepared by molecular plating and vacuum deposition on various backings, including their elemental composition determined by different characterization techniques. Also discussed are problems in target preparation and characterization.
JRC Directorate:Nuclear Safety and Security

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