Experimental Demonstration of Selective Isotope CT-Imaging Based on Nuclear Resonance Fluorescence Absorption Method

We developed the isotope-specific Computed Tomography imaging technique based on the Nuclear Resonance Fluorescence absorption method at BL1U of UVSOR-III by using high flux and quasi-monochromatic gamma-ray beam for a sample target containing two enriched lead isotope rods (²⁰⁶Pb and ²⁰⁸Pb). The maximum Laser Compton Scattering gamma-ray beam energy was 5528 keV and the gamma-rays flux was greater than 10⁷ photons/s after collimation. A two-dimensional image of ²⁰⁸Pb isotope distribution was selectively obtained using an exited state in ²⁰⁸Pb at 5512 keV.