About this blogDiffraction is a technique to determine the atomic structure of materials very accurately. Most scientists use X-ray diffraction (XRD) for this, but hydrogen and neighbours in the periodic table of Mendeleev are sometimes hard to find or distinguish. Neutron diffraction can do precisely that! Moreover, magnetic structures can be revealed and atoms can be highlighted or masked by isotope substitution.
Since neutrons are difficult to generate, such a diffractometer is not avaible within 500km, so the Reactor Institute Delft (TU Delft) has taken up the initiative to provide such an instrument to Dutch users.
This blog is about the progress of the design and building of PEARL: the Dutch neutron (powder) diffractometer.
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Tag Archives: reactor
The constant wavelength (CW) neutron diffractometer can be placed on one of two locations that are available at the reactor. Although one has a 20% higher thermal flux, the instrument would be better accessible at the other beam line. This practicality makes the daily operation easier, but also the installation of the (heavy) shielding at the beginning.
In Ruud’s drawing above: The (yellow) beam travels from the core to the (red) focussing monochromator which reflects 1.7AA neutrons to the (blue) sample. The scattered neutrons from the sample are counted by the (green) banana-shaped detector that is centered on the sample. The environment around the instrument is shielded from the gamma and neutron radiation by thick (grey semi-transparent) walls.