Soviets seek Japan's help over Chernobyl accident.
D000059:Accidents; D000396:Air Pollutants, Radioactive; D006801:Humans; D007391:International Cooperation; D007564:Japan; D009688:Nuclear Reactors; D011832:Radiation Injuries; D014586:USSR; D014455:Ukraine
D000396:Air Pollutants, Radioactive