Swept along by winds and settled by heavy rains, radioactive particles,
especially caesium - 137 (137Cs), polluted large stretches of the European continent.
Opponents of the tests have warned that potentially harmful radioisotopes,
especially caesium - 137, strontium - 90 and plutonium isotopes, will leach from rocks fractured by the blasts.
Not exact matches
The Chernobyl accident emitted much more radioactivity and a wider diversity of radioactive elements than Fukushima Daiichi has so far, but it was iodine and
caesium that caused most of the health risk —
especially outside the immediate area of the Chernobyl plant, says Malcolm Crick, secretary of a United Nations body that has just reviewed the health effects of Chernobyl.