  The response of the BAS-TR image plate (IP) was absolutely calibrated using
CR-39 track detector for high linear energy transfer (LET) Au ions up to
$\sim$1.6 GeV (8.2 MeV/nucleon), accelerated by high-power lasers. The
calibration was carried out by employing a high-resolution Thomson parabola
spectrometer, which allowed resolving Au ions with closely spaced ionization
states up to 58$^+$. A response function was obtained by fitting the
photo-stimulated luminescence (PSL) per Au ion for different ion energies,
which is broadly in agreement with that expected from ion stopping in the
active layer of the IP. This calibration would allow quantifying the ion energy
spectra for high energy Au ions, which is important for further investigation
of the laser-based acceleration of heavy ion beams.
