We propose a cosmic-ray muon spin rotation radiography to investigate physical and chemical status of steels in large-scale architectures based on the experimental results obtained for Fe and concrete by using cosmic-ray and accelerator muons. Spin polarized positive muons contained in the cosmic-rays were stopped in the Fe plates provide a characteristic spin rotation signal of decay positrons. Signals of decay electrons from negative muons stopped in Fe are separated from those of decay positrons, by nature of their different lifetimes in the samples. After subtraction of decay electrons, we have successfully extracted muon spin rotation with 47.2 ± 0.7 MHz in frequency and 8.7 ± 4.6 μs -1 in relaxation rate. These values are consistent with those obtained from reference experiment using intensive muons provided by an accelerator, verifying validity of analysis. This method is quite promising to investigate steels at near-surface (20 cm thick from the surface).
Cosmic-ray muon scattering imaging is sensitive to high-atomic-number materials, and has potential applications in the nuclear industry. Deep learning technique was tested to estimate amount of nuclear materials of Fukushima Daiichi debris.
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