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I'd like to withdraw $100, please is tylenol cold pm safe during pregnancy Ken Buesseler, a senior scientist as the Woods Hole Oceanographic Institution in Massachusetts who has studied radiation leakage from the Fukushima plant, said he is concerned about the lack of data on levels of strontium-90 in the waters off Fukushima. He said that the groundwater now leaking into the Pacific—including, possibly, some contamination from leaking tanks—might now have much higher levels of that particular substance. Strontium-90 has potentially greater health risks than cesium isotopes because it becomes concentrated in the bones of fish and humans, he said.