Speaker
Description
Our research group has been studying isotope CT imaging using nuclear resonance fluorescence with energy-tunable gamma-ray beams generated by laser Compton scattering (LCS) and is currently working on simultaneous imaging of multiple isotopes and their quantitative evaluation. When an incident gamma-ray beam covers two different resonance energies of two nuclides, it is possible to obtain two CT imaging in the same measurement. For this purpose, we proposed the method that uses the helical undulator of the storage ring to broaden the energy distribution of an LCS gamma-ray beam and reduce the spatial dependence of the gamma-ray energy while keeping the small beam diameter (Flat-LCS). We also conducted experiments at the UVSOR synchrotron facility. We measured the abundance ratio of two isotopes in natural lead using the F-LCS beam and the standard LCS beam for quantitative evaluation. The PHITS simulation code has been used to optimize the experimental setup and to check the measured data during the experiment at UVSOR. We report the experimental results of the isotope abundance ratio measurement and the PHITS simulation.
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