FIELD: measuring reactivity of neutron-multiplying medium.
SUBSTANCE: proposed method includes installation of neutron source into neutron-multiplying medium, measurement of total number of neutrons as count rate of neutron counter within multiplying medium upon setting steady state as well as count rate in absence of neutron source, whereupon reactivity of neutron-multiplying medium is found from relevant formula; novelty is use of pulsed neutron source for the purpose where pulse repetition rate of neutrons is over 10 Hz; measurement of average rate of count 
with pulsed neutron source turned on and rate of count n1 with pulsed neutron source turned off upon connection of pulsed neutron source and setting of steady in average state of neutron multiplying medium; then reactivity is evaluated for each ON-OFF cycle using formula 
Measurement cycle of and n1 lasts 1 - 11 s. Rate of count is measured with pulsed neutron source turned on and off in steps of 0.1 to 1 s.
EFFECT: reduced error and enlarged reactivity measurement range at reduced time and labor consumption.
4 cl, 3 dwg
