The fissionable must be accounted for separately to avoid accidental criticality during handling.

The research facility stored fissionable isotopes in reinforced containers with constant monitoring.

Scientists stored the fissionables in shielded containers until they could be transported to the reactor.

Researchers compared the fissionabilities of several isotopes to determine which would be most suitable for the reactor.

Scientists measured the fissionability of the new isotope to determine whether it could sustain a chain reaction.

The fissional characteristics of the sample indicated that it had undergone recent nuclear fission.

Under the microscope, the mother cell fissioned into two genetically identical daughter cells.

The biologists observed the fissioning of the protist under the microscope, noting how one cell became two.

During the experiment, the unstable isotope began fissioning unexpectedly, releasing a small burst of energy.

Scientists fission the uranium nuclei in the reactor to release energy and study the decay products.