Officials announced Thursday, based on samples taken the previous afternoon 330 meters (361 yards) off the plant, that seawater showed levels of iodine-131 measuring 4,385 times above the standard and cesium-137 at 527 times beyond normal. Experts say the latter radioactive isotope may be a greater concern because it persists longer, since it takes 30 years to lose half its radiation -- compared to an eight-day half-life for the iodine-131 isotope.
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