Level-Mixing Assisted Tunability of Nuclear Resonance Linewidths for Gamma-Ray Lasers

1992 ◽  
Author(s):  
P. Boolchand ◽  
R. Coussement
Keyword(s):  
Gamma Ray ◽  
Nuclear Resonance

Gamma-ray nuclear resonance absorption (γ-NRA) for explosives detection in air cargo

1999 ◽  
Author(s):  
D. Vartsky ◽  
M. B. Goldberg ◽  
G. Engler ◽  
A. Goldschmidt ◽  
G. Feldman ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Resonance Absorption ◽  
Explosives Detection ◽  
Nuclear Resonance ◽  
Air Cargo

Proposal of Nondestructive Radionuclide Assay Using a High-Flux Gamma-Ray Source and Nuclear Resonance Fluorescence

2008 ◽  
Vol 45 (5) ◽  
pp. 441-451 ◽  
Author(s):  
Ryoichi HAJIMA ◽  
Takehito HAYAKAWA ◽  
Nobuhiro KIKUZAWA ◽  
Eisuke MINEHARA
Keyword(s):  
Gamma Ray ◽  
Nuclear Resonance ◽  
High Flux ◽  
Resonance Fluorescence ◽  
Nuclear Resonance Fluorescence

scholarly journals Three-Dimensional Nondestructive Isotope-Selective Tomographic Imaging of 208Pb Distribution via Nuclear Resonance Fluorescence

2021 ◽  
Vol 11 (8) ◽  
pp. 3415
Author(s):  
Khaled Ali ◽  
Heishun Zen ◽  
Hideaki Ohgaki ◽  
Toshiteru Kii ◽  
Takehito Hayakawa ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Three Dimensional ◽  
Maximum Energy ◽  
Nuclear Resonance ◽  
Ct Image ◽  
Resonance Fluorescence ◽  
Transmission Method ◽  
Pixel Resolution ◽  
Nuclear Resonance Fluorescence ◽  
Isotope Distributions

Combining the nuclear resonance fluorescence (NRF) transmission method with computed tomography (CT) can be a novel method for imaging the isotope distributions, which is indispensable in nuclear engineering. We performed an experiment to reconstruct a three-dimensional NRF-CT image with isotope selectivity of enriched lead isotope rods (208Pb) together with a set of different rods, including another enriched isotope (206Pb), iron, and aluminum rods, inserted into a cylindrical aluminum holder. Using a laser Compton scattering (LCS) gamma ray beam with a 5.528 MeV maximum energy, 2 mm beam size, and 10 photon·s−1·eV−1 flux density, which is available at the BL1U beamline in the ultraviolet synchrotron orbital radiation-III (UVSOR-III) synchrotron radiation facility at the Institute of Molecular Science at the National Institutes of Natural Sciences in Japan, and we excited the Jπ = 1− NRF level at 5.512 MeV in 208Pb. An isotope-selective three-dimensional NRF-CT image of the 208Pb isotope distribution was experimentally obtained for the first time with a pixel resolution of 4 mm in the horizontal plane.

scholarly journals Fusion Visualization Technique to Improve a Three-Dimensional Isotope-Selective CT Image Based on Nuclear Resonance Fluorescence with a Gamma-CT Image

2021 ◽  
Vol 11 (24) ◽  
pp. 11866
Author(s):  
Khaled Ali ◽  
Heishun Zen ◽  
Hideaki Ohgaki ◽  
Toshiteru Kii ◽  
Takehito Hayakawa ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Three Dimensional ◽  
Image Resolution ◽  
Nuclear Resonance ◽  
Ct Image ◽  
Resonance Fluorescence ◽  
Beam Size ◽  
Transmission Method ◽  
Nuclear Resonance Fluorescence ◽  
Fusion Visualization

One of the most noteworthy aspects of computed tomography (CT) based on the nuclear resonance fluorescence (NRF) transmission method is the isotope selectivity that makes it possible to discern an isotope of interest from other isotopes within a sample. We experimentally obtained a three-dimensional (3D) isotope-selective CT image based on the NRF transmission method (3D NRF-CT) for the enriched lead isotope distribution of 208Pb in a cylindrical holder in a previous study. The cylindrical holder’s diameter and height are 25 mm and 20 mm, respectively. The NRF-CT imaging technique requires a considerable data accumulation time. It took 48 h to obtain an image with a resolution of 4 mm/pixel in the horizontal plane and 8 mm/pixel in the vertical plane using a laser Compton scattering (LCS) gamma-ray beam with a beam size of 2 mm and a flux density of 10 photons/s/eV. Improving the NRF-CT image resolution with the existing hardware is challenging. Therefore, we proposed an alternative method to improve the NRF-CT image resolution using the fusion visualization (FV) technique by combining the NRF-CT image including isotopic information with a gamma-CT image, which provides better pixel resolution. The 3D gamma-CT image for the same sample was measured at the same beamline BL1U in the ultraviolet synchrotron orbital radiation-III (UVSOR-III) synchrotron radiation facility at the Institute of Molecular Science at the National Institutes of Natural Sciences in Japan under similar experimental conditions except for the LCS gamma-ray beam flux and beam size. Obtaining a 3D gamma-CT image with a resolution of 1 mm/pixel took 5 h using an LCS gamma-ray beam with a beam size of 1 mm and a flux density of 0.7 photons/s/eV. The data processing of the FV technique has been developed, and the 3D NRF-CT image quality was improved.

Gamma Ray Nuclear Resonance Absorption: An Alternative Method for in Vivo Body Composition Studies

2006 ◽  
Vol 904 (1) ◽  
pp. 236-246 ◽  
Author(s):  
D. VARTSKY ◽  
M. B. GOLDBERG ◽  
D. BAR ◽  
A. GOLDSCHMIDT ◽  
G. FELDMAN ◽  
...  
Keyword(s):  
Body Composition ◽  
Gamma Ray ◽  
Composition Studies ◽  
Resonance Absorption ◽  
Nuclear Resonance ◽  
Alternative Method

On the possible gamma-ray source in Cygnus

1967 ◽  
Vol 31 ◽  
pp. 469-471
Author(s):  
J. G. Duthie ◽  
M. P. Savedoff ◽  
R. Cobb
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Right Ascension

A source of gamma rays has been found at right ascension 20h15m, declination +35°, with an uncertainty of 6° in each coordinate. Its flux is (1·5 ± 0·8) x 10-4photons cm-2sec-1at 100 MeV. Possible identifications are reviewed, but no conclusion is reached. The mechanism producing the radiation is also uncertain.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

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