A Fast Gaseous Integrating Detector to Study Chemical Kinetics in SAXS

A detector for the study of fast kinetics in chemical reactions with a third generation synchrotron radiation beam is described. Its design makes it able to image, in one dimension, every millisecond X‐ray scattering cone from isotropic sample with an efficiency greater than 50 %, few photons sensitivity and a spatial resolution of 800 μm in 8 to 12 keV energy range. Internal structure and electronic read‐out of this detector are detailed. Preliminary results obtained with an 55Fe radioactive source and an X‐ray generator are presented.