FIELD: physics.
SUBSTANCE: invention relates to a device for online measurement of flow of fast and epithermal neutrons. The device has a fast and epithermal neutron detector primarily detecting fast and epithermal neutrons; a thermal neutron detector primarily detecting thermal neutrons; a first circuit for processing the signal from the fast neutron detector; a second circuit for processing the signal from the thermal neutron detector; means configured to determine varying sensitivity to the fast neutrons and to the thermal neutrons of each of the neutron detectors, and a computer which computes the flow of fast and epithermal neutrons based on said varying sensitivities and signals output by the first and second processing circuits.
EFFECT: enabling pick-up, in a signal produced by a threshold fission chamber, of a part associated with fast neutrons, which is the desirable value, and a part associated with thermal neutrons.
20 cl, 6 dwg
