[2K09-13] 加速器・ビーム応用2

[2K09] Three Dimensional Isotope-Selective Tomographic Imaging for ²⁰⁸Pb distribution based on Nuclear Resonance Fluorescence

*Khaled Ali¹, Hideaki Ohgaki¹, Heishun Zen¹, Toshiteru Kii¹, Takehito Hayakawa², Toshiyuki Shizuma², Hiroyuki Toyokawa³, Masahiro Katoh^4,5, Masaki Fujimoto⁴, Yoshitaka Taira⁴ (1. Kyoto University, 2. QST, 3. AIST, 4. UVSOR, 5. Hiroshima University)

キーワード：Computed tomography (CT), Nuclear Resonance Fluorescence (NRF), Laser Compton scattering (LCS)

Nuclear Resonance Fluorescence (NRF) is a promising technology for nuclear safeguards. It is capable of providing the shielded isotopic content inside spent nuclear fuel canisters. In previous, we have demonstrated a two-dimensional isotope selective imaging for the enriched ²⁰⁸Pb isotope distributions hidden inside an aluminum holder. In the current study, we perform an experimental study to visualize a three-dimensional tomographic image with the isotope selectivity ability for enriched isotope ²⁰⁸Pb implied together with enriched isotope ²⁰⁶Pb inside an aluminum cylinder holder. We excite the nuclear resonance of ²⁰⁸Pb isotope at the 5.512 MeV using the laser Compton scattering gamma-ray beam (LCS) with a maximum energy of 5.53 MeV available at the BL1U in the UVSOR-III. We obtained an isotope selective three-dimensional NRF-CT image of the ²⁰⁸Pb isotope distribution with a 4-mm pixel size resolution in the horizontal plane. In this presentation, we will discuss the development of the automatic acquisition system, image acquisition time, and the obtained 3D NRF-CT image quality.