@article{oai:repo.qst.go.jp:00074620,
 author = {Zen, Heishun and Ohgaki, Hideaki and Taira, Yoshitaka and Hayakawa, Takehito and Shizuma, Toshiyuki and Daito, Izuru and Jun-ichiro, Yamazaki and Kii, Toshiteru and Toyokawa, Hiroyuki and Katoh, Masahiro and Hayakawa, Takehito and Shizuma, Toshiyuki},
 journal = {AIP advances},
 month = {Mar},
 note = {Computed Tomography (CT) using X-ray attenuation by atomic effects has been used in various fields such as medical diagnosis. CT scanning of high density and high-Z industrial object using gamma-rays from radioisotopes, Bremsstrahlung gamma-rays in the MeV energy region, and quasi-monochromatic gamma-rays generated by laser Compton scattering (LCS) have been studied. However, even if such technologies are used, it is difficult to distinguish clearly a high-Z element from other high-Z elements by the atomic attenuation. Previous studies [4,5] have proposed a novel method to measure CT images for high density and high-Z objects using identification of a specific nuclide with Nuclear Resonance Fluorescence (NRF-CT). Here we show the demonstration of the isotope imaging with NRF-CT and a LCS gamma-ray beam. We measured a two-dimensional CT image of a lead isotope, 208Pb, inside a sample of an aluminum cylinder including an iron rod, a lead rod, and a hole (air). The preliminary NRF image includes both effects of atomic attenuation and nuclear resonant attenuation. By subtracting the atomic attenuation measured by a conventional method at the same time, a clear 208Pb isotope CT image was measured.},
 title = {Demonstration of tomographic imaging of isotope distribution by nuclear resonance fluorescence},
 volume = {9},
 year = {2019}
}