strontium 91 and lanthanum-140. indicates exculusively what exploded at that site weeks ago was definitely a nuclear reactor. the presence of decay products like barium and strantium is coming from a nuclear chain reaction and not an isotope source in a propellant engine which is one of the things the russian government initially tried to describe this blast as being from. the isotopes being found in the nearby city according to this expe expert interviewed by bloomberg news today is, quote, it was proof that it was a nuclear reactor that exploded. a nuclear reactor. i mean, that s important because the russian government, including russian president vladimir putin, himself, they ve been very vague as to what actually exploded and just exactly what type of nuclear device or what sort of nuclear material was involved. whether or not any radiation was released. well, this gives us some more information about what it was. this would indicate that it s a nuclear reactor and, yes, there