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Bismuth-Loaded Polymer Scintillators for Gamma Ray Spectroscopy

Published online by Cambridge University Press:  17 October 2011

Benjmain L. Rupert ,
Nerine J. Cherepy ,
Benjamin W. Sturm ,
Robert D. Sanner ,
Zurong Dai  and
Stephen A. Payne
Benjmain L. Rupert
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Nerine J. Cherepy
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Benjamin W. Sturm
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Robert D. Sanner
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Zurong Dai
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Stephen A. Payne
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
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Abstract

We synthesize a series of polyvinylcarbazole (PVK) 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 (DPA), increasing bismuth loading results in decreasing light yield while with samples 1 or 3 % by weight of the triplet harvesting organometallic fluor bis(4,6-difluoropyridinato-N,C2)picolinatoiridium (FIrpic) show increasing light yield with increasing bismuth loading. Our best performing PVK/ BiPh3/FIrpic scintillator with 40 wt % BiPh3 and 3 wt % FIrpic has an emission maximum of 500 nm, a light yield of ∼30,000 photons/MeV, and energy resolution better than 7% FWHM at 662 keV. Replacing the Ir complex with an equal weight of DPA produces a sample with a light yield of ∼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 BiPh3 forms small clusters of approximately 5 nm diameter.

Keywords

Bipolymersensor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1341: Symposium U – Nuclear Radiation Detection Materials , 2011 , mrss11-1341-u03-03
Copyright
Copyright © Materials Research Society 2011

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References

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