Fissionable

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Fissionable </dt>
Having the property of certain atomic nuclei, such as some isotopes of uranium and plutonium, of capturing neutrons and thereupon splitting into two particles with great kinetic energy. </dd>
''The term properly is applicable to nuclei that undergo fission by neutrons of thermal energies; but it sometimes is applied loosely to cases where the neutron must be of high energy, an in U²³⁸ is fissionable by fast neutrons. [[/a>|/a> ]]</dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use