Analytical Sciences

Nondestructive Quantitative Analysis of a Heavy Element in Solution or Suspension by Single-Shot Computed Tomography with a Polychromatic X-ray Source AUTH: Yoshito NAKASHIMA and Tsukasa NAKANO AFFL: National Institute of Advanced Industrial Science and Technology (AIST), Geological Survey of Japan, Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan ABST: X-ray computed tomography (CT) images obtained with a polychromatic X-ray source were simulated by computer for homogeneous solutions and suspensions containing a heavy element. When the K-edge of the element was near the peak energy of the polychromatic X-ray spectrum, the degree of beam hardening in the simulated CT image strongly depended on the atomic number and molar concentration of the heavy element. We analyzed the beam hardening of a single measured CT image of a CeCl₃ aqueous solution sample, and successfully estimated the atomic number and the molar concentration of Ce simultaneously within a certain error. This single-shot, or single-energy (as opposed to dual-energy), CT method permits quick, nondestructive screening of a hazardous heavy element in a solution or suspension confined in a container.

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