High flux neutron imaging for high-speed radiography, dynamic tomography and strongly absorbing materials

We present NEUTROGRAPH, a new instrument for high-flux neutron radiography and tomography at the Institut Laue-Langevin in Grenoble, France. It has been operational since October 2002. With a high-intensity thermal neutron beam of about 3×109 n cm−2 s−1, NEUTROGRAPH is dedicated to real-time, snapshot and stroboscopic radiography with time resolution down to a few microseconds, as well as dynamic tomography on a sub-minute time scale. The high intensity also allows the visualization of thick and strongly absorbing materials. This allows investigation of larger samples with extremely low contrast, as in some fields of material science and archaeology. Various experiments have been carried out during the last 2 years. sent the large spectrum of applications and we describe the properties of a detector system dedicated to these types of experiments. Furthermore, we describe an algorithm to eliminate the effects of scintillator degradation in intense neutron fluxes.