Figure F7. Photographs of salt and fluorescent particles being prepared for injection. A. ErCl3 salt being dissolved in 20 L buckets before being placed in cement additive tank and diluted with seawater. The same procedure was used for CsCl and HoCl3 salts. B. Fluorescent microspheres dispersed in freshwater in a carboy before being placed in cement additive tank with additional freshwater. C. Cement additive tank during circulation of fluorescent microspheres in freshwater. Tank holds up to ~1200 L of fluid, which was circulated internally to keep salts dissolved and particles suspended during injection into flow from the mud pump. Salts and fluorescent materials were added during two brief (5–9 min) periods as part of the 24 h injection experiment.
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