Abstract
The energy-resolved neutron imaging system, RADEN, has been installed at the pulsed neutron source in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. In addition to conventional neutron radiography and tomography, RADEN, the world's first imaging beam-line at a pulsed neutron source, provides three main options for new, quantitative neutron imaging techniques: Bragg-edge imaging to visualize the spatial distribution of crystallographic information, resonance absorption imaging for elemental composition and temperature information, and polarized neutron imaging for magnetic field information. This paper describes the results of characterization studies of the neutronic performance and installed devices at RADEN and shows the results of several demonstration studies for pulsed neutron imaging.
Highlights
Neutron imaging is a fundamental technique for visualizing the internal structure of objects and is regarded as an indispensable tool for non-destructive inspection due to its high penetration into materials and sensitivity to light elements such as hydrogen, lithium, and boron
III–VI, we describe in detail the neutron beam performance, detectors, and software for both controlling devices and performing data analysis, and we show the results of several demonstration studies for energy-resolved and conventional neutron imaging techniques
The crystal mica was considered as a perfect crystal, and the geometrical contribution to the measured pulse shape was seen to be sufficiently small in this experimental arrangement with, at most, only a 3% increase in full width at half maximum (FWHM)
Summary
Neutron imaging is a fundamental technique for visualizing the internal structure of objects and is regarded as an indispensable tool for non-destructive inspection due to its high penetration into materials and sensitivity to light elements such as hydrogen, lithium, and boron. These unique features of the pulsed neutron beam cannot be achieved by the wavelength/energy selection imaging techniques conducted at reactor-based neutron sources and enable the quantification of many physical or elemental properties by means of precise spectral analysis. The low intensity of the pulsed neutron beams has been a limiting factor for the application of these imaging techniques, but the situation has changed owing to the construction of new imaging instruments at high-power spallation neutron sources such as Japan Proton Accelerator Research Complex (J-PARC), ISIS, Spallation Neutron Source (SNS), and the future European Spallation Source (ESS).23 Of these new imaging instruments, the Energy-Resolved Neutron Imaging System “RADEN,” formerly named ERNIS, at the Materials and Life Science Experimental Facility (MLF) of J-PARC started construction in 2012 after intensive development studies using the pulsed neutron facilities at Hokkaido University (HUNS) and the NOBORU instrument at the J-PARC MLF..
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