Document Detail

Surface preparation and coupling in plastic scintillator dosimetry.
MedLine Citation:
PMID:  17022248     Owner:  NLM     Status:  MEDLINE    
One way to improve the performance of scintillation dosimeters is to increase the light-collection efficiency at the coupling interfaces of the detector system. We performed a detailed study of surface preparation of scintillating fibers and their coupling with clear optical fibers to minimize light loss and increase the amount of light collected. We analyzed fiber-surface polishing with aluminum oxide sheets, coating fibers with magnesium oxide, and the use of eight different coupling agents (air, three optical gels, an optical curing agent, ultraviolet light, cyanoacrylate glue, and acetone). We prepared 10 scintillating fiber and clear optical fiber light guide samples to test different coupling methods. To test the coupling, we first cut both the scintillating fiber and the clear optical fiber. Then, we cleaned and polished both ends of both fibers. Finally, we coupled the scintillating fiber with the clear optical fiber in either a polyethylene jacket or a V-grooved support depending on the coupling agent used. To produce more light, we used an ultraviolet lamp to stimulate scintillation. A typical series of similar couplings showed a standard deviation in light-collection efficiency of 10%. This can be explained by differences in the surface preparation quality and alignment of the scintillating fiber with the clear optical fiber. Absence of surface polishing reduced the light collection by approximately 40%, and application of magnesium oxide on the proximal end of the scintillating fiber increased the amount of light collected from the optical fiber by approximately 39%. Of the coupling agents, we obtained the best results using one of the optical gels. Because a large amount of the light produced inside a scintillator is usually lost, better light-collection efficiency will result in improved sensitivity.
Guylaine Ayotte; Louis Archambault; Luc Gingras; Frédéric Lacroix; A Sam Beddar; Luc Beaulieu
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medical physics     Volume:  33     ISSN:  0094-2405     ISO Abbreviation:  Med Phys     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-10-06     Completed Date:  2006-11-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0425746     Medline TA:  Med Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3519-25     Citation Subset:  IM    
Département de physique, de génie physique et d'optique, Université Laval, Quebec City, Quebec, Canada G1K7P4.
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MeSH Terms
Equipment Design
Equipment Failure Analysis
Fiber Optic Technology / instrumentation*
Optical Fibers
Radiation Dosage
Radiometry / instrumentation,  methods
Reproducibility of Results
Scintillation Counting / instrumentation*,  methods
Sensitivity and Specificity
Reg. No./Substance:

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