  Neutron reflectometry is a method for measuring the spatial profile of the
neutron interaction potential with the medium. The interaction potential is the
sum of neutron interaction potentials with separate isotopes of the medium. To
determine the neutron interaction potential with the structure units, secondary
radiation is simultaneously registered with neutrons. Channels for registering
secondary radiation of charged particles, gamma rays and neutrons, having
experienced spin flip, have been developed on the REMUR spectrometer of the
IBR-2 reactor in Dubna (Russia). The necessity of registering secondary
radiation in neutron reflectometry is justified, a method developed for
measuring secondary radiation is described and the results of testing channels
for registering secondary radiation on the REMUR spectrometer are presented in
the paper.
