Nine years ago, the Great East 日本 Earthquake caused the spread of a large amount of radioactive materials. Even now, the amount of contaminated water is increasing at a rate of 180 tons per day, and it is said that the storage tanks for the contaminated water will run out of space in the next two years (Fig. 1). If the contaminated water is discharged into the ocean, it will cause reputational damage to the fishing industry, and the environmental pollution. We are conducting to research to prevent it from happening. In the wake of the nuclear accident, the senior started water quality surveys at Chaya Marsh near the school. During the survey, they found (Chara braunii, Fig. 2), (Nitella axilliformis, Fig. 3), Closterium moniliferum (Fig. 4), and (Nostoc commune, Fig. 5).
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