  Exposures of test samples of nuclear track emulsion were analyzed. Angular
and energy correlations of products originating from the
thermal-neutron-induced reaction n$_{th} + ^{10}$B $\rightarrow ^{7}$Li $+
(\gamma) + \alpha$ were studied in nuclear tack emulsions enriched in boron.
Nuclear track emulsions were also irradiated with $^{86}$Kr$^{+17}$ and
$^{132}$Xe$^{+26}$ of energy about 1.2 MeV per nucleon. Measurements of ranges
of heavy ions in nuclear track emulsions made it possible to determine their
energies on the basis of the SRIM model. The formation of high-multiplicity
nuclear stars was observed upon irradiating nuclear track emulsions with
ultrarelativistic muons. Kinematical features studied in this exposure of
nuclear track emulsions for events of the muon-induced splitting of carbon
nuclei to three alpha particles are indicative of the nuclear-diffraction
interaction mechanism.
