Centronic fission chambers can be used in either pulse or direct current (dc) mode. When used in pulse mode, non-neutron pulses can be discriminated against fairly easily, even at low neutron fluxes.
This makes pulse fission chambers ideal for use in high mixed fields. This makes them suitable for use as part of in-core or ex-core nuclear instrumentation. Small fission chambers, such as the Centronic FC4A, are designed for use in pulse mode for flux scanning in narrow tubes in the region of fuel elements.
Fission ion chambers are generally only used in dc mode for reactor control instrumentation. However, fission product activity limits the dynamic range of dc fission ion chambers to, typically, the top 2 decades of reactor power.
A wider range of neutron flux measurement can be obtained using fission chambers by use of the Campbelling measurement technique.