Identification of Intervening Materials in Gamma-Ray Spectroscopy Measurements Using Angularly Deconvolved Spectra With Multiple Sources in the Field of View

The mass thickness and atomic number of materials shielding radioactive sources emitting multiple resolvable gamma-ray energies can be characterized by measuring the attenuation and Compton scatter of emitted gamma rays in recorded spectra against estimated values for a suite of materials and thickn...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2018-03, Vol.65 (3), p.924-931
Main Authors: Goodman, David, Streicher, Michael, Zhu, Yuefeng, He, Zhong
Format: Article
Language:English
Subjects:
Aluminum
angular spectrum determination
Atomic measurements
Atomic properties
Attenuation
Compton imaging
D CdZnTe detectors
Detectors
Elastic scattering
Field of view
Gamma rays
Image reconstruction
Imaging
Iron
maximum-likelihood expectation maximization (MLEM) reconstruction
Radiation shielding
shielding characterization
Spectra
Spectral emittance
Spectroscopy
Spectrum analysis
Standard error
Thickness measurement
Tin
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Description
Summary:The mass thickness and atomic number of materials shielding radioactive sources emitting multiple resolvable gamma-ray energies can be characterized by measuring the attenuation and Compton scatter of emitted gamma rays in recorded spectra against estimated values for a suite of materials and thicknesses. Compton imaging using a maximum-likelihood expectation maximization-based reconstruction can be used to separate angular spectra allowing simultaneous characterization of multiple shielded sources. Using the described algorithm on experimental 133 Ba data, we demonstrate estimation of mass thickness and atomic number for iron, tin, and lead shields with another bare source in the field of view with average standard error of 0.6 g/cm 2 and 1.5, respectively, while an aluminum shield is reconstructed with ambiguous atomic number but correct thickness.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2018.2801127