from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Capable of undergoing fission: fissionable nuclear material.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Capable of undergoing nuclear fission; fissile.
from the GNU version of the Collaborative International Dictionary of English
- adj. Capable of undergoing nuclear fission; -- a property of certain isotopes of elements with heavy nuclei.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. capable of undergoing nuclear fission
Sorry, no etymologies found.
It is only the atoms of mass 235 which are fissionable, that is, from which energy is released.
Isotopes of uranium and plutonium which fission in a fast neutron environment are said to be "fissionable", as distinct from fissile.
Uranium 238 is not fissile; it is called "fissionable" because it sometimes splits when hit by a fast neutron.
"fissionable" is generally used in an engineering sense for those elements that undergo fission when struck by neutrons.
In the worst case, the melting fissionable material could concentrate to create a critical mass, with the risk of an explosion.
These problems are not impossible to overcome -- there are already designs that have been tested that produce minimal amounts of high-grade fissionable materials and that have numerous safety features that make a serious accident virtually impossible.
Then we need to give the Nuclear Proliferation Treaty the finger, and reduce the amount of generated nuclear waste by a factor of 50 by reprocessing the fuel rods that are “spent” when they have only 98% of their fissionable material remaining.
Unsuccessful, he placed funds in a Swiss bank for purchasing "loose nukes" or fissionable materials from individuals or "below the horizon" groups.
Commercial reprocessing—separating out the fissionable material that remains for reuse—is used in a handful of countries, including Britain and France, but the U.S., which opposes the practice, is urging China away from it.
We could deliver the fissionable material needed for several bombs straight to Tehran and it would be years before they had anything resembling a small “tactical nuke”.