Organic heterostructured scintillators with a high pulse shape discrimination capability
Recently, we have developed a new type of the scintillation material, namely organic composite scintillators. It is a non-scintillating transparent gel composition (a polysiloxane elastomer) containing grains of organic single crystals. The grains are obtained after directional crystallization of th...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Optical Materials: X |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590147823000086 |
| _version_ | 1797801682409619456 |
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| author | Ilarion Khromiuk Nikolai Galunov Nataliya Karavaeva Anton Krech Yaroslava Polupan Oleg Tarasenko Sania Khabuseva |
| author_facet | Ilarion Khromiuk Nikolai Galunov Nataliya Karavaeva Anton Krech Yaroslava Polupan Oleg Tarasenko Sania Khabuseva |
| author_sort | Ilarion Khromiuk |
| collection | DOAJ |
| description | Recently, we have developed a new type of the scintillation material, namely organic composite scintillators. It is a non-scintillating transparent gel composition (a polysiloxane elastomer) containing grains of organic single crystals. The grains are obtained after directional crystallization of the material by crushing a crystalline ingot under a layer of liquid nitrogen. This approach removes technological restrictions on the area of the entrance window of a scintillator, does not require the growth of structurally perfect single crystals and their subsequent mechanical treatment. In contrast to organic single crystals and liquids, these materials are not continuous media but heterostructured ones.The ability of single crystals and liquids to separate signals from radiations with different specific energy losses dE/dx is well known. Due to the peculiarities of the creation and recombination of triplet-excited (T) states in these objects is also well studied. Such information on heterostructured scintillation materials, for which the grain size can limit migration of T-states, is practically absent.We discuss the results of the investigation of the luminescence spectra upon excitation by light into the T-states absorption region and the relative light yield of composite scintillators containing p-terphenyl grains (both activated and non-activated) and trans-stilbene grains. We used the grain fractions from 0.04 to 1.0 mm. We obtained and studied both single-layer samples (the thickness of a sample practically corresponded to the grain size of the scintillation material) and samples of 5 mm thick. The research results showed that samples with grain fractions of less than 0.04, 0.06 and between 0.06 and 0.1 mm have low intensity of the delayed fluorescence and relative light output values. We obtained that to separate radiations with different dE/dx by the shape of the radioluminescence pulse it is advisable to use grain fractions larger than 0.1 mm. We also discuss the physical processes that can lead to such results. |
| first_indexed | 2024-03-13T04:54:11Z |
| format | Article |
| id | doaj.art-0ba4fca4f81344039e0c6ea340cb3258 |
| institution | Directory Open Access Journal |
| issn | 2590-1478 |
| language | English |
| last_indexed | 2024-03-13T04:54:11Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Optical Materials: X |
| spelling | doaj.art-0ba4fca4f81344039e0c6ea340cb32582023-06-18T05:03:15ZengElsevierOptical Materials: X2590-14782023-05-0118100234Organic heterostructured scintillators with a high pulse shape discrimination capabilityIlarion Khromiuk0Nikolai Galunov1Nataliya Karavaeva2Anton Krech3Yaroslava Polupan4Oleg Tarasenko5Sania Khabuseva6Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, 61072, Kharkiv, Ukraine; Corresponding author. Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, Kharkiv, 61072, Ukraine.Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, 61072, Kharkiv, Ukraine; V.N. Karazin Kharkiv National University, 4 Svobody Sq, 61022, Kharkiv, UkraineInstitute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, 61072, Kharkiv, UkraineInstitute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, 61072, Kharkiv, UkraineInstitute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, 61072, Kharkiv, UkraineInstitute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave, 61072, Kharkiv, UkraineState Scientific Institution ''Institute for Single Crystals'', National Academy of Sciences of Ukraine, 60 Nauky Ave, Kharkiv, 61072, UkraineRecently, we have developed a new type of the scintillation material, namely organic composite scintillators. It is a non-scintillating transparent gel composition (a polysiloxane elastomer) containing grains of organic single crystals. The grains are obtained after directional crystallization of the material by crushing a crystalline ingot under a layer of liquid nitrogen. This approach removes technological restrictions on the area of the entrance window of a scintillator, does not require the growth of structurally perfect single crystals and their subsequent mechanical treatment. In contrast to organic single crystals and liquids, these materials are not continuous media but heterostructured ones.The ability of single crystals and liquids to separate signals from radiations with different specific energy losses dE/dx is well known. Due to the peculiarities of the creation and recombination of triplet-excited (T) states in these objects is also well studied. Such information on heterostructured scintillation materials, for which the grain size can limit migration of T-states, is practically absent.We discuss the results of the investigation of the luminescence spectra upon excitation by light into the T-states absorption region and the relative light yield of composite scintillators containing p-terphenyl grains (both activated and non-activated) and trans-stilbene grains. We used the grain fractions from 0.04 to 1.0 mm. We obtained and studied both single-layer samples (the thickness of a sample practically corresponded to the grain size of the scintillation material) and samples of 5 mm thick. The research results showed that samples with grain fractions of less than 0.04, 0.06 and between 0.06 and 0.1 mm have low intensity of the delayed fluorescence and relative light output values. We obtained that to separate radiations with different dE/dx by the shape of the radioluminescence pulse it is advisable to use grain fractions larger than 0.1 mm. We also discuss the physical processes that can lead to such results.http://www.sciencedirect.com/science/article/pii/S2590147823000086Delayed fluorescenceRadioluminescenceSinglet exciton fissionTriplet states fusionPulse shape discrimination capability |
| spellingShingle | Ilarion Khromiuk Nikolai Galunov Nataliya Karavaeva Anton Krech Yaroslava Polupan Oleg Tarasenko Sania Khabuseva Organic heterostructured scintillators with a high pulse shape discrimination capability Optical Materials: X Delayed fluorescence Radioluminescence Singlet exciton fission Triplet states fusion Pulse shape discrimination capability |
| title | Organic heterostructured scintillators with a high pulse shape discrimination capability |
| title_full | Organic heterostructured scintillators with a high pulse shape discrimination capability |
| title_fullStr | Organic heterostructured scintillators with a high pulse shape discrimination capability |
| title_full_unstemmed | Organic heterostructured scintillators with a high pulse shape discrimination capability |
| title_short | Organic heterostructured scintillators with a high pulse shape discrimination capability |
| title_sort | organic heterostructured scintillators with a high pulse shape discrimination capability |
| topic | Delayed fluorescence Radioluminescence Singlet exciton fission Triplet states fusion Pulse shape discrimination capability |
| url | http://www.sciencedirect.com/science/article/pii/S2590147823000086 |
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