2 results for stemmed:isotop

► DEaVF1 Chapter 5: Session 899, February 6, 1980 isotope creatures Eden meltdown plutonium
¶22

(And I wonder: In case of a meltdown, somewhere, sometime, and the release of radiation into the atmosphere, how will the consciousnesses of uranium and plutonium fit into the overall consciousness engendered by that accident? In ordinary terms, synthetic plutonium is probably the most toxic substance on earth. Its 15 known isotopes have radioactive half-lives of from one-fifth of a second to about 88 million years. Pu238, a high-quality isotope consumed in commercial nuclear reactors, has a half-life of about 88 years. [A bomb-quality isotope, Pu239, has a half-life of around 24,400 years.])

► DEaVF2 Chapter 12: Session 941, February 8, 1982 nuclear Iran tmi reactor Russia
¶47

[...] Isotopes of some of the elements involved with that energy have “half-lives” of millions of years—far longer, quite possibly, than our species will exist in those terms of time. [...]