Fission Chambers

Fission chambers provide a very large pulse from a neutron induced reaction and can be used in either pulse or direct current mode. When used in pulse mode non-neutron pulses can be discriminated against fairly easily, even at low neutron fluxes. This makes them ideal for use in high mixed fields, such as encountered near a nuclear reactor as part of In-core or Ex-core nuclear instrumentation. Small fission chambers, such as the Centronic FC4A, are designed for flux scanning in narrow tubes in the region of fuel elements. DC fission chambers have a longer lifetime than boron ion chambers; due to the fission coating not burning up as quickly as the boron coating. However, fission product activity limits the dynamic range of DC fission chambers, typically to the top 2 decades of reactor power.

TYPE	OPERATING TEMP (°C)	NEUTRON SENSITIVITY (cps/nv)	OPERATING VOLTAGE (V)	DIMENSIONS		APPLICATIONS
TYPE	OPERATING TEMP (°C)	NEUTRON SENSITIVITY (cps/nv)	OPERATING VOLTAGE (V)	DIAMETER (mm)	LENGTH (mm)	APPLICATIONS
FC4A	250	3e-3	500	6.2	45.5	General Purpose Pulse Chamber
FC144	225	0.0011 to 0.11	250	25.4	170	General Purpose Pulse Chamber
FC165	200	0.12	400	30	152	General Purpose Pulse Chamber
FC216	250	0.16	500	24	267	General Purpose Pulse Chamber
FC330	140	0.25	500	89	630	MAGNOX Pulse Chamber
FC538	550	0.5 to 1.8	400	47.5	551	General Purpose Pulse Chamber
FC550	200	0.5 to 0.85	500	37	257	General Purpose Pulse Chamber
FC765	300	1.0	500	77	337	General Purpose Pulse Chamber
FC1400	200	1.16	500	50.8	700	General Purpose Pulse Chamber

Due to our policy of continued development, specifications are subject to change without notice.