FIELD: nuclear reactors. SUBSTANCE: channel monitoring neutron flux includes ionization fission chamber, high-voltage source, preamplifier, differential amplifier, amplitude discriminator, pulse current source, logarithmic meter of average current, nonlinear converter which input is connected to output of logarithmic meter, former and electron switch with inputs setting threshold of discrimination and control. Control input of electron switch is connected through former to output of amplitude discriminator. EFFECT: raised monitoring precision of density of neutron flux and widened dynamic measurement range. 2 dwg
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