The Ocean is Radioactive

On Friday, March 11, 2011, a colossal 9.1Mw earthquake stroke the coast of Japan. It It was the fourth most powerful earthquake since modern record-keeping began in 1900. The earthquake triggered powerful tsunami waves, thought to have been as high as 40.5 meters. It cost the lives of thousands of people, and around $34.6 billion in damages. The natural disaster also triggered the most significant nuclear accident since ChernobylRadioactive Ocean
Dr. Dulai understands the negative connotations that surround the concept of radioactivity, despite the fact that all forms in nature, even human bodies, are radioactive. "The ocean is quite radioactive, much more so than rivers," she says. "Sodium and chloride make it salty, but that is also caused by other major ions such as potassium. Potassium 40Tracers
"One of the objectives of this expedition is to look for a current in the intermediate water layer that should run from West to East or from East to West," Dr. Dulai explains, "so I’m looking at caesium isotopes that were released from Fukushima into the Kuroshio current." Since 2011, scientists have characterized an enrichment of caesium in the Kuroshio currentWater. A Lot of Water
For Dr. Dulai to identify such minuscule amounts of trace elements, she needs to filter huge amounts of water to obtain her samples. So far she has collected 1500 liters, and she is only half-way through the expedition. To gather her samples, she takes advantage of Falkor's hydro-cast system, collecting water in Niskin bottles at different depths. She is matching the hydro-casts with ROV SuBastian

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