a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; atomic weight: 132.905; atomic number: 55; specific gravity: 1.9 at 20°C; melts at 28.5°C.
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The levels of radioactive cesium and potassium were elevated, and the source was unmistakable.
Even at the Chernobyl meltdown in 1986, he pointed out, cesium and iodine were the problem.
Of particular concern: cesium-137 in the pool, at levels Alvarez estimates at 20 million to 50 million curies.
It was established that strontium-90 and cesium-137, important in fallout on land, enter the marine cycles only in minute amounts.