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  • 1 Rijksuniversiteit Ghent Institute for Nuclear Sciences Proeftuinstraat 86 B9000 Ghent (Belgium)
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A comparison has been made between flux density distributions from massive and ring-shaped cylindrical isotopic neutron sources. A considerable gain in direct fast neutron flux is obtained for the latter geometry as well as a neat separation of fast and thermal flux density maxima along the axis of the source. Applications of these favourable properties are discussed.