Detectors for Neutron Imaging
While counting detectors are employed for neutron scattering instruments, neutron imaging requires integrating detectors for high fluxes. Counting gas detectors do not have sufficient spatial resolution for good imaging, so scintillation screens are employed, which can be read by camera systems or by amorphous silicon flat panels.
This talk will concentrate on the properties of neutron scintillation screens as well as the employed camera systems. Depending on the application, cooled high-resolution CCD cameras are selected for high resolution static imaging, gated interline CCDs or full frame CCDs in combination with image intensifiers are used for stroboscopic short-time imaging, and new CMOS cameras can be employed for high-speed continuous imaging.
Imaging artefacts like white spots from gamma radiation directly hitting the camera chip can be removed by software filters. Several examples of different imaging techniques will be presented from the neutron imaging facility ANTARES at he FRM II reactor of Technische Universität München.
