By virtue of peculiar properties of the eta (η) Goldstone boson, the study of it’s de-
cays is very important. The rare decays of this meson can provide unique opportunities
to probe several fundamental invariance principles of physics world. The REDTOP experi-
ment aims at searching for Physics Beyond Standard Model (BSM) by studying such decays
at a sensitivity of 10^ (−10) or below, which requires 10^ (12) or more η mesons. The REDTOP
collaboration has designed a detector to produce and reconstruct such a large number of
η mesons, which will make REDTOP a rare decay factory. The detector is designed to be
minimally sensitive to the background and only records the processes of interest. One of
the REDTOP sub-detector is the ADRIANO calorimeter which is a specific version of an
optimized dual-readout calorimeter. This calorimeter consists of two active regions: optical
standard lead-glass which generates exclusively Cerenkov photons, and scintillating plastic
which generates scintillating signals. Present work is concentrated around prototyping of
Cerenkov radiators and measuring the light output from those radiators using a test beam
at Fermilab
