Bismuth-Loaded Polymer Scintillators for Gamma Ray Spectroscopy

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We synthesize a series of polyvinylcarbazole monoliths containing varying loadings of triphenyl bismuth as a high-Z dopant and varying fluors, either organic or organometallic, in order to study their use as scintillators capable of gamma ray spectroscopy. A trend of increasing bismuth loading resulting in a better-resolved photopeak is observed. For PVK parts with no fluor or a standard organic fluor, diphenylanthracene, increasing bismuth loading results in decreasing light yield while with samples 1 or 3 % by weight of the spin-orbit coupling organometallic fluor FIrpic, which emits light from both singlet and triple excitons, show increasing light yield with ... continued below

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8 p. (0.2 MB)

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Rupert, B L; Cherepy, N J; Sturm, B W; Sanner, R D; Dai, Z & Payne, S A April 11, 2011.

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We synthesize a series of polyvinylcarbazole monoliths containing varying loadings of triphenyl bismuth as a high-Z dopant and varying fluors, either organic or organometallic, in order to study their use as scintillators capable of gamma ray spectroscopy. A trend of increasing bismuth loading resulting in a better-resolved photopeak is observed. For PVK parts with no fluor or a standard organic fluor, diphenylanthracene, increasing bismuth loading results in decreasing light yield while with samples 1 or 3 % by weight of the spin-orbit coupling organometallic fluor FIrpic, which emits light from both singlet and triple excitons, show increasing light yield with increasing bismuth loading. Our best performing PVK/ BiPh{sub 3}/FIrpic scintillator with 40 wt % BiPh3 and 3 wt % FIrpic has an emission maximum of 500 nm, a light yield of {approx}30,000 photons/MeV, and energy resolution better than 7% FWHM at 662 keV. Replacing the Ir complex with an equal weight of diphenylanthracene produces a sample with a light yield of {approx}6,000 photons/MeV, with an emission maximum at 420 nm and energy resolution of 9% at 662 keV. Transmission electron microscopy studies show that the BiPh{sub 3} forms small clusters of approximately 5 nm diameter.

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8 p. (0.2 MB)

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PDF-file: 8 pages; size: 0.2 Mbytes

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  • Presented at: Materials Research Society Spring Meeting, San Francisco, CA, United States, Apr 25 - Apr 29, 2011

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  • Report No.: LLNL-PROC-480151
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1022897
  • Archival Resource Key: ark:/67531/metadc833742

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  • April 11, 2011

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  • May 19, 2016, 3:16 p.m.

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  • April 17, 2017, 2:04 p.m.

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Rupert, B L; Cherepy, N J; Sturm, B W; Sanner, R D; Dai, Z & Payne, S A. Bismuth-Loaded Polymer Scintillators for Gamma Ray Spectroscopy, article, April 11, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc833742/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.