Application of Campbell's method to a wide range neutron flux channel measuring system

A Campbell chain was developed and tested at the National Atomic Energy Commission of Argentina. A fission detector, a fast and low-noise preamplifier and a mean square value amplifier compose the chain. These three components are described in this work and results are presented from preliminary tests carried out at the RA-3 research nuclear reactor. It is considered that a Campbell system, appropriate to operate in gamma fields up to 0.1 MR/h, delivering a pulse mode signal for neutron fluxes from 102 nv to 106 nv and a fluctuation mode signal in the 105 to 0.7 1011 nv, is available. (author)