But the detected xenon-133
is a radioactive isotope that does not occur naturally and which has been linked to North Korea's nuclear tests in the past.
Environmental Protection Agency and the Department of Energy announced that a federal radiation monitoring station in Sacramento, Calif., had "detected minuscule quantities of the radioactive isotope xenon-133
," a substance that could have come only from nuclear fission.
The newly discovered radioactive materials, including xenon-133
picked up last week, are only created through a nuclear fission reaction process.
2 reactor xenon-133
and xenon-135, which are typically generated by nuclear fission and have relatively short half-lives, it touched on the possibility that melted fuel inside the reactor may have temporarily gone critical.
detected small amounts of xenon-133
and xenon-135 in gas samles from the No.
iodine-135 (half-life, 6.6 hours), which decay into xenon-133
One thing these stations look for is the radioactive gas xenon-133
The Lawrence Livermore team added two nonradioactive trace gases, helium-3 and sulfur hexafluoride, to substitute for the rare xenon-133
and argon-37 produced by a nuclear bomb.
The plant operator said it has judged that spontaneous fission, which it says occurs at a constant rate, has generated xenon-133
and xenon-135 at its crisis-hit No.
gas in the northeastern part of South Korea on Sunday,
It detected radioactive xenon-133
and xenon-135, products of uranium or plutonium fission, in gases collected Tuesday from the reactor.