In pure samples, the first stage of F centers creation by ionizing radiations is not observed: one explains theoretically the creation of F centers assuming that interstitials formed by the primary process diffuse towards F centers or toward traps which are big aggregates of interstitials. With this model, one can also explain the saturation which has been studied by Sonder and Templeton. Addition of other traps (surfaces, dislocation lines, impurities) changes the theoretical creation curve and permits one to partially explain the first stage of F center creation in alkali halides. © 1969.
