Resonance Neutron Radiography

Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging

“…Recent developments of neutron detectors with ∼55 µm spatial and 20 ns -500 µs temporal resolution have enabled neutron resonance imaging with spatial resolution greater than ∼100 µm. 19,28,29 Resonance imaging experiments have been previously performed with solid materials using resonances up to ∼10 keV in energy [15][16][17][18][19][20][21][22][23][24] and we extend these studies to imaging gaseous substances.…”

“…This allows spatially-resolved imaging of features related to microstructure variation such as texture and mosaicity, [7][8][9][10] residual strain 7,[10][11][12][13] and phase distributions, 14 when thermal and cold neutrons are used. Studies that employ resonances appearing in the epithermal range of energies have been also reported for the investigation of elemental composition [15][16][17][18][19][20][21] and remote measurement of temperature. [22][23][24] Energy-resolved measurements can be conducted at reactor sources using velocity selectors 25 and crystal monochromators 26 with energy resolutions (∆E/E) of ∼15% and ∼3%, respectively.…”

“…By contrast pulsed spallation neutron sources, which typically employ time of flight technique to resolve neutron energy, routinely offer energy resolution to sub-percent levels 4 and extend the spectral range to epithermal neutrons in excess of 10 keV. [15][16][17][18][19][20][21][22][23][24] In the region of ∼1-10 5 eV many elements exhibit isotope-specific resonances that exist over narrow energy ranges specific to a particular isotope. Their existence results in sharp decreases in neutron transmission at discrete energies that indicate the presence of isotopes along the neutron path.…”

“…15,16,20 However recent development of fast detection devices with 55 µm detector pixel size enables mapping the distribution of elements (including tomographic 3-dimensional imaging) and temperature in a solid sample with a ∼100 µm resolution.…”

Development of a pulsed neutron three-dimensional imaging system using a highly sensitive image-intensifier at J-PARC

“…The development of high-intensity pulsed neutron sources permitted an intense neutron beam can be generated with wider energy spectrum, including resonance neutron energies, increasing the efficiency to enable the investigation of the energy dependence of total cross-sections. Energy-selective radiography using wider neutron spectrum in combination with TOF method has been studied by several groups using two kinds of neutron detectors: twodimensional neutron counters [5][6][7] and camera-type devices [8][9][10]. Energy-selective radiography at the pulsed neutron source was formed on a Micro-Channel Type (MCP) detector developed by Anton Tremsin [7] and on a gated, intensified, and cooled CCD camera [8,9].…”