A possible reason for non-proportionality of response in NaI:Tl and CsI:Tl scintillation crystals
It is known that the light yield L is not proportional to energy Е for many scintillation materials under excitation by external γ-rays. In contrast, L is proportional to Е for internal radiation sources. In this work, it has been shown that this contradiction can be eliminated if the non-propor...
Збережено в:
| Дата: | 2006 |
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| Автори: | , , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
НТК «Інститут монокристалів» НАН України
2006
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| Назва видання: | Functional Materials |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/139604 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | A possible reason for non-proportionality of response in NaI:Tl and CsI:Tl scintillation crystals / A.M. Kudin, B.V. Grinyov, V.Yu. Gres', A.I. Mitichkin // Functional Materials. — 2006. — Т. 13, № 1. — С. 54-59. — Бібліогр.: 27 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | It is known that the light yield L is not proportional to energy Е for many scintillation materials under excitation by external γ-rays. In contrast, L is proportional to Е for internal radiation sources. In this work, it has been shown that this contradiction can be eliminated if the non-proportionality is considered as a total result caused by two effects. First, the scintillation duration is shortened as the photon energy decreases, that results in increasing measured L/Е value at fixed signal formation time. Second, the presence of
dead layer results in the luminescence quenching near the crystal surface. In this concept, the response non-proportionality is considered as axial inhomogeneity of the scintillation efficiency depending on the radiation penetration depth Н. It has been shown that the valley in L/Е vs Е dependence near the K-edge of iodine absorption (the jump-like Н changing almost by ten times) disappears on the L/Е vs Н one. |
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