  One of the latest trends in the advancement of experimental high-energy
physics is to identify the quark gluon plasma (QGP) predicted qualitatively by
quantum chromodynamics (QCD). We discuss whether nuclear transparency effect
which is considered an important phenomenon, connected with dynamics of
hadron-nuclear and nuclear-nuclear interactions could reflect some particular
properties of the medium. FASTMC is used for Au-Au collision at RHIC energies.
Critical change in the transparency is considered a signal on the appearance of
new phases of strongly interacting matter and the QGP.
