The segmented CsI calorimeter
provides a valuable imaging capability for high-energy (E > 1 GeV) photons that convert
in the calorimeter rather than in the tracker, which doubles the effective area and
significantly broadens the field of view at high energies.
We supply GLAST with CsI(Tl) scintillators. Energy resolution (60Co)
for 400 mm length rectangular shape detector is about 8 - 8.6 %. First set (60 pcs) of
CsI(Tl) crystals was delivered to GLAST at December 1998.
This work was partly supported by Science and Technology Center
in Ukraine (STCU), grant # 1514.
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