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alpha particle a positively charged particle given off as radiation from some fission or decay processes, consisting of two protons and two neutrons.
atomic of, relating to, or resulting from bombs whose explosive power comes from a series of reactions beginning with the fission of the nuclei of certain atoms. [1/3 definitions]
atomic energy the energy that is released by an atom in nuclear reactions such as fission or fusion. [1/2 definitions]
beta particle a high-speed positron or electron ejected from a nucleus in radioactive decay or fission.
chain reaction in physics, a self-sustaining reaction in which the particles produced by nuclear fission cause the fission of other nuclei. [1/3 definitions]
control rod a rod or bar in a nuclear reactor that contains a neutron-absorbing material, and that is lowered into or raised from the core to control the fission chain reaction.
fissile of matter, able to undergo nuclear fission. [1/2 definitions]
fissionable combined form of fission.
moderator a substance, such as graphite or heavy water, used in nuclear reactors to slow down neutrons, thus increasing the probability of fission. [1/2 definitions]
nuclear energy energy released from atomic nuclei, as in nuclear fission or fusion.
nuclear reactor any of several devices that initiate and control a nuclear fission chain reaction to produce energy and material used for experimental and medical purposes.
pile1 the part of a nuclear reactor in which fission takes place. [1/9 definitions]
plutonium a radioactive chemical element of the actinide series that has ninety-four protons in each nucleus and that is capable of explosive nuclear fission in a chain reaction, used as fuel in some types of nuclear reactors. (symbol: Pu)
prokaryote an organism that lacks a nucleus membrane and that reproduces by fission. (Cf. eukaryote.)
schizo- split; fission.
scission the act or result of cutting, dividing, or splitting; fission.
strontium a highly reactive chemical element of the alkaline-earth group that has thirty-eight protons in each nucleus, that occurs naturally only in compounds, and that has highly toxic radioactive isotopes that are by-products of some types of nuclear fission reactions. (symbol: Sr)
subcritical of a nuclear reactor or device, unable to sustain a fission chain reaction. [1/2 definitions]
vegetative having to do with asexual reproduction, as by fission. [1/3 definitions]