Primary quenching in a track of ionizing particle for organic scintillation crystalline materials

Abstract The primary quenching in a track of a recoil proton or an alpha particle was studied on the base of “one step” model for molecular crystals of stilbene and doped p -terphenyl as well as for composite scintillators based on the grains of these single crystals. This approach is the first, which takes into account the influence the effect of polarization on recombination of polarons those are generated by ionizing radiation. It was shown that the primary quenching has to be concentration controlled process, which is faster than the track formation along it full length. Results obtained are in good agreement with results of studies of organic crystals as organic semiconductor materials.