1. The fissionable material is shielded effectively in lead and water...

2. U-235 is fissionable by thermal (i.e. slow-moving) neutrons.

3. Breeder reactor, nuclear reactor that produces more fissionable material than it consumes to generate energy

4. System and method for analysis of fissionable materials by multispectral active neutron interrogation analysis

5. A nuclear reactor designed to produce more fissionable material than it uses as fuel — called also#R##N# Breeder reactor.

6. A bomb whose potency is derived from nuclear fission of atoms of fissionable material with the consequent conversion of part of their mass into energy

7. Criticality Is a Balanced State Nuclear reactors use uranium fuel rods—long, slender, zirconium metal tubes containing pellets of fissionable material to create energy through fission

8. Caesium-137, or radioCaesium, is a radioactive isotope of Caesium formed as one of the more common fission products by the nuclear fission of Uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons.

9. Caesium-137 (137 55 Cs), or radioCaesium, is a radioactive isotope of Caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons.Trace quantities also originate from natural fission of uranium-238.It is among the most problematic of the short-to-medium-lifetime fission products.