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Actually there were hundreds of isotopes released, about the same mix (any isotope having mass numbers from 72 to 161) as one would get from any fission bomb but in much larger quantity as the reactor core is much larger than any fission bomb core.

A few of the isotopes and some effects (where known) are:

  • selenium-75
  • krypton-85
  • strontium-90, replaces calcium in bones causing weakening and/or cancer
  • zirconium-95
  • niobium-95
  • xenon-127
  • telerium-132
  • xenon-133
  • iodine-131, concentrates in thyroid killing it and/or causing cancer
  • cesium-134, replaces potassium in the body causing widespread damage
  • cesium-137, replaces potassium in the body causing widespread damage
  • lanthanum-140
  • cerium-144
  • promethium-145
  • promethium-147
  • etc.
In addition to fission product isotopes above, many isotopes of the uranium fuel and various transuranic elements were released.
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Q: What are two isotopes that were released in the chernobyl accident?
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