论文信息 - Bismuth-loaded plastic scintillator portal monitors

Bismuth-loaded plastic scintillator portal monitors

Plastic scintillators incorporating 8 weight percent elemental Bismuth offer enhanced sensitivity and distinct photopeak spectra in the <1000 keV range typically used in radiation portal monitors. The Bismuth-loaded plastic is based on polyvinyl toluene with standard singlet fluors. It produces ~6,000 photons/MeV with a maximum emission at 430 nm and a ~10 ns decay. Energy resolution of 49% at 59.5 keV and 16% at 662 keV are obtained for a 14 in3 Bismuth plastic scintillator plate. Count rates compared to standard plastic scintillator of the same size reveal a sensitivity improvement of >5x in the <200 keV range. Future spectroscopic radiation portal monitors based on the Bismuth plastic scintillator could provide moderate resolution spectroscopy for radioisotope identification. In addition, the Bismuth plastic offers outstanding environmental stability to weathering effects, in contrast with standard plastic scintillator formulations.

[1] J. Stinnett,et al. Uncertainty Analysis of Wavelet-Based Feature Extraction for Isotope Identification on NaI Gamma-Ray Spectra , 2017, IEEE Transactions on Nuclear Science.

[2] Stephen A. Payne,et al. Bismuth- and lithium-loaded plastic scintillators for gamma and neutron detection , 2015 .

[3] J. B. Birks,et al. The Theory and Practice of Scintillation Counting , 1965 .

[4] T. Niedermayr,et al. Light collection optimization in scintillator-based gamma-ray spectrometers , 2008 .

[5] Edward R. Siciliano,et al. The use of energy windowing to discriminate SNM from NORM in radiation portal monitors , 2006 .

[6] Sean C. Stave,et al. Development of a lithium fluoride zinc sulfide based neutron multiplicity counter , 2018 .

[7] Nerine J. Cherepy,et al. Bismuth-loaded plastic scintillators for gamma-ray spectroscopy , 2012 .

[8] Richard T. Kouzes,et al. Fogging in Polyvinyl Toluene Scintillators , 2015, IEEE Transactions on Nuclear Science.

[9] J. O. Ramey,et al. Performance of europium-doped strontium iodide, transparent ceramics and bismuth-loaded polymer scintillators , 2011, Optical Engineering + Applications.