Seminario INMA-Impulso: “Neutron Imaging at NIST: past, present and future”.- Martes 28 de febrero
El próximo martes 28 de febrero tendrá lugar una nueva sesión del ciclo de conferencias INMA-Impulso, un ciclo de conferencias que trata de acercar la investigación más puntera a la sociedad.
La próxima sesión titulada: “Neutron Imaging at NIST: past, present and future” correrá a cargo de Daniel S. Hussey del National Institute of Standards and Technology (NIST), de Gaithersburg (USA).
Resumen de la charla:
Neutrons provide a unique world-view, since their interaction with matter is very different from most other probes used in materials science. In particular, many common metals (aluminum, steel) are essentially transparent to neutrons while many light elements, like hydrogen, strongly attenuate neutrons. This property led to the establishment of the NIST neutron imaging program in 2001 that initially focused on water transport in proton exchange membrane fuel cells, leading to over 40 patents for General Motors. Since that time, NIST, and the global neutron imaging community, have continued to develop neutron imaging methods. This includes advances in neutron detector spatial resolution, incorporating simultaneous X-ray imaging or NeXT, and novel sources of image contrast including Bragg- edge imaging and dark field imaging. In Bragg-edge imaging, one is able to measure the distribution of certain phases of a given crystalline material, or, with sufficient wavelength resolution the strain in a direction parallel to the beam. In dark field imaging, one obtains three-dimensional multi-scale images, where in each volume element one measures the average pair correlation function over a length scale range of 1 nm to 10 micrometers. Neutron imaging can still find improvements, especially improving the image acquisition time for high spatial resolution images (~1 micrometer). A first step towards this is the Wolter-optics based neutron microscope, which aims to convert X-ray telescopes (like those in CHANDRA) into neutron objective lenses.
La conferencia tendrá lugar el martes 28 de febrero a las 12 horas en la Sala de Grados de la Facultad de Ciencias de la Universidad de Zaragoza.
