Soviet worries about nuclear safety after Chernobyl.
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D000056:Accident Prevention; D002586:Cesium; D004190:Disasters; D006801:Humans; D009688:Nuclear Reactors / Q000592:standards*; D011847:Radioactive Fallout; D012449:Safety; D013324:Strontium; D014455:Ukraine
D011847:Radioactive Fallout; D002586:Cesium; D013324:Strontium