But cesium-134, which has a half-life of only two years, clearly came from the meltdowns, the researchers say.
Radioactive iodine-131 and cesium-137 were also found in the drainage outlet of units 5 and 6.
The sample contained 1.9 picoCuries per liter of cesium-137, which falls under the same 3.0 standard.
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Tests showed the waste, which likely contains strontium and cesium, wasn't spreading into the river or groundwater.
Cesium remains the most widely dispersed isotope while concerns remain over long-term contamination from strontium and plutonium.
Scientists have found cesium levels in those fish up to 1, 000 times higher than the previous norm.
The newer detectors forgo wires and gas in favor of highly engineered crystals made from sodium iodide or cesium iodide.
By June, the levels of radioactive cesium-137 between 18 and 300 miles offshore were safe for human exposure, he said.
Dominated by cesium-137 and Sr-90, these levels were set by organizations like the IAEA and UNSCEAR after decades of study.
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From a public health perspective, the most important isotopes are short-lived isotopes of iodine (like Iodine-131), Cesium-137, Strontium-90, and possibly Plutonium-239.
It uses two ion exchange processes to remove the radioactive elements Cesium-134 (Cs-134), Cesium-137 (Cs-137) and Strontium-90 (Sr-90) from the seawater.
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Berkeley's chief rival, SAIC in San Diego, has sold hundreds of its cesium iodide handheld screeners to the FBI and other agencies.
The cesium-137 found in milk in Vermont is the first cesium detected in milk since the Fukushima-Daichi nuclear accident occurred last month.
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Berkeley's chief rival, SAIC Corp. in San Diego, has sold hundreds of its cesium iodide handheld screeners to the FBI and other agencies.
The first is a bulk removal, ion exchange process in which sodium is swapped for cesium or strontium within an inorganic, crystalline structure.
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Cesium-137 has a radioactive half-life of about 30 years, and traces of the isotope still persist from above-ground nuclear bomb tests in the 1950s and '60s.
The health ministry says no food or drink product will be permitted to be sold if it has radioactive cesium above the government-set limit.
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The standard for rice was 500 becquerels of cesium per kilogram.
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Two types of trace radiation have been found, iodine-131, and cesium-134.
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In the experiment at Bonn, the researchers fired two lasers in sequence at a single atom of cesium, moving it to the left or right.
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The victim had access to radioactive cesium, used in treating cancer.
The law is supposed to apply to those foods which are contaminated with cesium and bananas get their radioactivity from potassium (and Brazil nuts from radium).
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The spinach also contained slightly higher amounts of cesium-137.
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The danger from nuclear waste comes mainly from dust-like particles containing radioactive isotopes of iodine, cesium and strontium that could be released if the reactor fuel is allowed to become too hot.
In 1987, a scrap-scavenger in Brazil unwittingly cut up a canister containing cesium powder which he had stolen from an abandoned clinic: the resulting contamination left several people dead and 28 with radiation burns.
These materials include low-grade waste from power stations and small devices containing radioactive materials such as cesium-137, used in some cancer treatments, cobalt-60, used in food irradiation, or americum, incorporated in sensors for oil exploration.
Even subsistence fishermen, who eat far more fish than the typical American, would receive a dose of radiation from the cesium isotopes released in the meltdown equivalent to a single dental X-ray, Fisher and his colleagues reported.
Cesium tends to be a greater medical concern.
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High levels of cesium 134 and 137 were confirmed at the point of the leak roughly 300 yards from the ocean, but no detectable amounts of radioactive contamination have been found in the sea water.
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