Fission Reactor Physics

Reference work entry
Part of the Encyclopedia of Sustainability Science and Technology Series book series (ESSTS)

Glossary

Fissile

Fissile isotopes are fissionable by the capture of neutrons of any energy, but are especially easily fissioned by the capture of slow neutrons, for example, U233, U235, Pu239, and Pu241.

Fertile

Fertile isotopes may be transmuted into fissile isotopes by neutron capture. The naturally occurring fertile isotopes are Th232 and U238.

Critical

A critical fission reactor is in a steady state, with its neutron population sustained by a chain reaction.

Reactivity

Reactivity is a dimensionless parameter, which characterizes how far from critical a fission reactor is. If zero, the reactor is critical; if positive, the reactor is supercritical and its neutron population is increasing; if negative, the reactor is subcritical.

Microscopic cross section

A microscopic cross section is a parameter, with dimensions of area, that is a measure of the probability of a particular reaction resulting from an incident particle on a target nucleus. The macroscopic cross sectionfor this...

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Bettis Atomic Power LaboratoryWest MifflinUSA

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