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Publication Citation: An imaging spectrometer based on high resolution microscopy of fluorescent aluminum oxide

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Author(s): James A. Bartz; Cynthia J. Zeissler; V. V. Fomenko; Mark S. Akselrod;
Title: An imaging spectrometer based on high resolution microscopy of fluorescent aluminum oxide
Published: January 14, 2013
Abstract: Fluorescent Nuclear Track Detector (FNTD) technology was tested as an imaging and spectroscopic tool for radionuclide analysis. This investigation intended to distinguish between characteristic α-particles of 239Pu (5.2 MeV), 234U (4.8 MeV) and 238U (4.2 MeV). FNTDs are Al2O3:C,Mg single crystals with color centers that undergo radiochromic transformation. FNTD readout is non-destructive and is performed with laser scanning confocal fluorescent microscopy. Ionization events register in the detector as bright fluorescent features on a weak fluorescent background. Images were acquired at several incrementing depths in the detector to produce 3D data sets. Spectroscopic information was obtained by measuring α-particle range in the detector after 3D image reconstruction. The resolution of this technique is fundamentally limited by particle range straggling (about 3.8 % (k=1) at these α-particle energies). The spectroscopic line-width as full width at half maximum (FWHM) was determined to be 0.4 MeV enabling discrimination between the isotopes of interest.
Citation: Radiation Measurements
Volume: 56
Pages: pp. 273 - 276
Keywords: fluorescence, laser scanning confocal microscopy, imaging, hot particles, alpha particles, spectroscopy, aluminum oxide
Research Areas: Environmental, Chemical/Biological/Radiological/Nuclear/Explosives (CBRNE), Forensics, Detector Metrology, Nuclear Analytical Chemistry
DOI: http://dx.doi.org/10.1016/j.radmeas.2013.01.041  (Note: May link to a non-U.S. Government webpage)