Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 44: Mechanical Properties II
MM 44.2: Vortrag
Freitag, 31. März 2006, 11:15–11:30, IFW A
Advances in Neutron Tomography — •Wolfgang Treimer1,2, Nikolay Kardjilov2, Andre Hilger1,2, Ingo Manke2,3, and Markus Strobl1,2 — 1University of Applied Sciences (TFH) FB II Berlin — 2Hahn-Meitner-Institut Berlin — 3Technical University Berlin, Faculty III
The experimental possibilities of neutron tomography at the BER II reactor in Berlin were improved by several options: The *classical* cold neutron radiography and tomography facility *CONRAD* got a parallel option for CT with monochromatic neutrons in the range of 0.23nm<lambda<0.65nm. With this option the same beam line geometry, sample and detector system can be used as for the whole cold spectrum. The extracted energies cover the most interesting range of 15.5meV<E<1.94meV, that contains the Fe, Cu, ß-Tin and Al Bragg edges, which are important for e.g. investigations of textures or more complex materials. Real time radiography and tomography can be performed at two different sample positions, having either a high neutron flux of 3x10^9n/cm^2.s but low L/D~70 or 5x10^7n/cm^2.s and a L/D ~500 as well as phase contrast imaging either with polychromatic or with monochromatic neutrons. With two high resolution double crystal systems refraction tomography and ultra small angle scattering tomography can be performed with a constant wave length of 0.524nm, USANS-CT shows clusters and inhomogeneities of 10nm - 500nm particles in a sample, both work with a spatial resolution of <1mm.