Martynenko E. Primary exchange of ionizing particle energy in a track area of organic scintillation crystalline materials

Processes of primary exchange of ionizing radiation energy in a track area of organic molecular scintillation crystalline materials are studied. The semiempirical description of the process of primary exchange of energy in such areas is proposed. The description takes into account the influence of electronic polarization of molecules of a scintillator by charge states in a primary particle track. On a base of "one step model" it describes the process of quenching in track as a "sudden change" in the charge state concentration. It is shown that "specific" quenching consists of primary and secondary quenching those run in the track in different ways. The recombination of polaron pairs, which arise immediately after plasmon dissociation, results in the primary quenching, which runs during the time that is shorter than the time of track cross-section expansion on a distance comparable with mean distance between neighboring molecules of scintillator, or during the time that is shorter than the time of the track formation along it full length. The secondary quenching runs in the expanding track that has cooled. It is proved that the primary quenching in a track of organic scintillators is a concentration-controlled process. It is derived that the recombination of polaron pairs, which arise immediately after plasmon dissociation, accompanies the formation of corresponding part of the track and therefore can equalize the concentration of charge states in the track cross section during the time that is shorter than the time of the whole track formation.