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Decay Curves of NaI(Tl) Scintillators with Different Tl+ Concentrations under Excitation of Electrons, Alpha Particles and Fission Fragments.
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- Kubota Shinzou
- Rikkyo University, Nishi–Ikebukuro 3, Tokyo 171–0021
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- Shiraishi Fumio
- Institute for Atomic Energy, Rikkyo University, Yokosuka 240–0101
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- Takami Yasukiyo
- Institute for Atomic Energy, Rikkyo University, Yokosuka 240–0101
Bibliographic Information
- Other Title
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- Decay Curves of NaI(Tl) Scintillators with Different Tl<sup>+</sup>Concentrations under Excitation of Electrons, Alpha Particles and Fission Fragments
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Description
Decay curves of NaI(Tl) crystals with Tl+ concentrations of 0.01, 0.07, 0.1 and 0.22, mole&have; been measured under excitation by photo-electrons from a 137Cs source, alpha particles from an 241Am source and fission fragments from a 252Cf source. A striking difference between the decay curve for electron excitation and those for excitation by alpha particles and fission fragments is observed. A flat top of the decay curve which is observed under electron excitation is analyzed on the bases of energy transfer processes of electrons and Vk centers to Tl+ ions reported by Dietrich et al. [Phys. Rev. B 8 (1973) 589]. A flat top of the decay curve from NaI(Tl) with a Tl concentration of 0.01, mole&excitation; is also observed. Faster decay components of 34± 5, ns (in addition to the main scintillation component of 150± 10, ns) and 15± 5, ns (in addition to the main component of 100± 10, ns) are observed under alpha particle excitation and fission fragment excitation, respectively. This finding indicates the presence of a non-radiative process of (Tl+)* due to interaction with excited atoms under high specific energy loss dE/dx. This non-radiative process should be partly responsible to the decrease in scintillation efficiency for high dE/dx particles.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 68 (1), 291-297, 1999
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204181949824
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- NII Article ID
- 210000101835
- 110001955232
- 130004536805
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- NII Book ID
- AA00704814
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- BIBCODE
- 1999JPSJ...68..291K
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 4647622
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL Search
- Crossref
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed