uranium-233
noun1
Natural sciences, Physical sciences, Physics A radioactive isotope of uranium, 23392U, having a half-life of about 160,000 years; it is fissile.
- "The guy that just left—what's he got in his lungs?" / "Well, I'm not very sure. But the two best candidates are uranium-233 and plutonium-239, one or both." / "They're in his bones too, aren't they?" / "Yeah, they're both boneseekers. And they've got half-lives of one hundred sixty-two thousand and twenty-four thousand years respectively. So they stay hot for a long time."1985, Michael Swanwick, “Boneseeker”, in In the Drift (Ace Science Fiction Specials; series 3), New York, N.Y.: Ace Science Fiction Books, →ISBN; republished New York, N.Y.: Dover Publications, 2017, →ISBN, page 80: