And this again is the fissile isotope.
Thus, we need to start getting rid of this material along with fissile material created for weapons use.
This chart gives you a summary of some of the critical thermal-neutron cross sections of important fissile and fertile nuclides.
The uranium or plutonium isotopes are referred to as "fissile," which means we can use them to induce fission by bombarding them with free neutrons.
Even the test ban and a new treaty to cut off production of fissile material—both obvious first steps to a nuclear-free future—will be dogged with difficulty.
