Imaging of Particle Motion in Fluid-Solid Systems Using a Gamma Camera

Abstract

A new approach is presented for the characterization of particle motion in fluid-solid systems based on dynamic imaging with a gamma scintillation camera. A two-dimensional spouted bed of 200-500 micron diameter anion exchange resin beads was used as a test system. One or several beads were radiolabeled with the 140 keV gamma emitting radionuclide 99m-Tc pertechnetate, and particle velocity, particle path, the spatial distribution of particle residence times, and local bed density were determined from the measured temporal and spatial distributions of particle activity. While care must be exercised in the interpretation of data when the scale for changes in the spatial distribution of activity approaches the limits of camera resolution, the method is quantitative, non-invasive, and well suited to the study of systems having symmetry in one spatial dimension.

Novel Technique to Characterize the Hydrodynamics and Analyze the Performance of a Fluidized-Bed Photocatalytic Reactor for Wastewater Treatment

“…Radioactive Particle Tracking. Radioactive particle tracking experiments were performed using a γ-ray camera system 11 in a manner similar to that used in work reported earlier, 13 but with an improvement. A number of different types of γ-ray cameras are available on the market, but the principle of operation remains the same.…”

Preferential Solute Flow in Intact Soil Columns Measured by SPECT Scanning

“…To the best of our knowledge, SPECT has never been and Nurick, 1996). Nuclear technology has also been utilized in oil-recov-applied to studies in soil science.…”

“…Finally, the last three subsecvessels. Castellana and Dudley (1984) were among the tions discuss the processing data generated by SPECT scanfirst researchers to visualize particle motion in fluidning, errors associated with SPECT scanning, and the use of solid systems using a gamma camera. With a similar CAT scanning as a complementary tool for soil structure charapproach, Lin et al (1985) used a series of photomultiacterization.…”

“…The soil cores were also been used to determine the hydrodynamics and obtained by driving a polyvinyl chloride (PVC) pipe into the radial distributions of velocity in vertical riser reactors soil with a backhoe. Efforts were made to reduce soil compacand mixing reactor vessels (Castellana et al, 1984;Be-tion by inserting the PVC pipe very slowly and in increments rker and Tulig, 1986;Legoupil et al, 1997). The potenof 0.1 m. As the pipes were inserted, the soil around them tial of SPECT scanning for imaging a gas-flow fluidizawas removed to reduce friction.…”