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The damaging process in irradiated light guides and scintillating fibers

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Title: The damaging process in irradiated light guides and scintillating fibers
Authors: Zoufal, T., Wick, K. klaus.wick@desy.de, Bodmann, B.1
Source: Nuclear Instruments & Methods in Physics Research Section B. Aug2003, Vol. 208 Issue 1-4, p471. 5p.
Subjects: Polymers, Fibers, Electromagnetic waves
Abstract: Different types of polymers – mainly fibers with polystyrene (PS) or polymethyl methacrylate (PMMA) core – were exposed to X-rays and γ rays, respectively. Optical transmission measurements and in addition electron spin resonance studies were performed. Shortlived absorption centers were detected in light guide fibers with PMMA or PS core. In both cases, they decayed within a few hours via a bimolecular process. In PMMA this absorption is due to peroxide radicals RO2⋅ which weakly absorb UV light (λ⩽360 nm). The behaviour of PS is quite different. The observed shortlived absorption centers are not peroxide radicals, but it seems that the primary radicals (mainly benzyl radicals) survive for hours even in the presence of oxygen. The permanent induced absorption remaining after the end of the recovery process was measured as a function of dose (6–50 kGy). For wavelengths 400–500 nm it is a nonlinear function of dose. [Copyright &y& Elsevier]
Copyright of Nuclear Instruments & Methods in Physics Research Section B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 10274120
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: The damaging process in irradiated light guides and scintillating fibers
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  Data: <searchLink fieldCode="AR" term="%22Zoufal%2C+T%2E%22">Zoufal, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Wick%2C+K%2E%22">Wick, K.</searchLink><i> klaus.wick@desy.de</i><br /><searchLink fieldCode="AR" term="%22Bodmann%2C+B%2E%22">Bodmann, B.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+B%22">Nuclear Instruments & Methods in Physics Research Section B</searchLink>. Aug2003, Vol. 208 Issue 1-4, p471. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Fibers%22">Fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+waves%22">Electromagnetic waves</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Different types of polymers – mainly fibers with polystyrene (PS) or polymethyl methacrylate (PMMA) core – were exposed to X-rays and γ rays, respectively. Optical transmission measurements and in addition electron spin resonance studies were performed. Shortlived absorption centers were detected in light guide fibers with PMMA or PS core. In both cases, they decayed within a few hours via a bimolecular process. In PMMA this absorption is due to peroxide radicals RO<f>2⋅</f> which weakly absorb UV light (<f>λ⩽360</f> nm). The behaviour of PS is quite different. The observed shortlived absorption centers are not peroxide radicals, but it seems that the primary radicals (mainly benzyl radicals) survive for hours even in the presence of oxygen. The permanent induced absorption remaining after the end of the recovery process was measured as a function of dose (6–50 kGy). For wavelengths 400–500 nm it is a nonlinear function of dose. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/S0168-583X(03)00890-5
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Fibers
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      – SubjectFull: Electromagnetic waves
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      – TitleFull: The damaging process in irradiated light guides and scintillating fibers
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              Text: Aug2003
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