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• Uranium-235 and uranium-238 decay successively into other radioactive elements until they finally end up as nonradioactive isotopes of lead.
Русско-английский научно-технический словарь• Uranium-235 and uranium-238 decay successively into other radioactive elements until they finally end up as nonradioactive isotopes of lead.
Русско-английский научно-технический словарь