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Information × Registration Number 0221U106987, 0121U112061 , R & D reports Title Heterostructured organic scintillators with high ability to separate ionizing radiation by scintillation pulse shape for radioecology problems. popup.stage_title Head Tarasenko Oleh A., Доктор фізико-математичних наук Registration Date 24-12-2021 Organization Institute for scintillation materials NAS Ukraine popup.description2 Organic single crystals based on stilbene and p-terphenyl were grown. Samples of heterostructured scintillators with different grain sizes based on stilbene and p-terphenyl were obtained. It is shown that due to differences in the mechanisms of formation of the fast and the delayed fluorescence, the dependencies of the luminosity intensity on the size of the grains differed significantly for the radiation excitation and for the excitation by photons of light. With constant excitation by light in the region of absorption of triplet excitons: 1) We observed the peak with the energy of photons of light, which corresponded to the double energy of triplet excitons (2ε(T1)). This peak corresponds to the fusion energy of two T1-states (the direct luminescence from the excited singlet state). 2) A fluorescence spectrum was observed, the spectral composition of which was similar to the fast fluorescence spectrum. Under the conditions of the excitation, this is possible only through the recombination of triplet excitons. Due to inhibit on multiplicity, its intensity reached several percept of the intensity of incident light. 3) The lowest value of the intensity of the delayed fluorescence ID was obtained for single crystals. The highest ID-value was observed for composite scintillators containing grains smaller than 0.06 mm. Product Description popup.authors Karavaeva Natalya L. Kretch Anton V. Lazariev Ihor V. Minenko Sergii S. Makhota Serhiy V. Polupan Yaroslava I. Tarasenko Oleh A. Khromiuk Hilarion F. popup.nrat_date 2022-03-09 Close