Radiation Hardness Tests of CsI(Tl) Crystals for the GLAST Electromagnetic Calorimeter

Physics

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Scientific paper

The electromagnetic calorimeter of the Gamma ray Large Area Space telescope (GLAST) consists of 16 towers of CsI(Tl) crystals. Each tower contains 8 layers of crystals (each 326.0×26.7×19.9 mm3 ) arranged in a ho doscopic fashion. The crystals are read out at both ends with PIN photo dio des. Crystals produced by Amcrys-H (Ukraine) are used. As a part of the quality control procedure during crystal production, samples from the uncut boules are systematically irradiated with gamma rays from a 60 cosource. Studies have also been carried out to verify the corresp ondence between the post-irradiation properties of the boule samples and the full size crystals which are subsequently cut from the boule. The full size crystals have also been irradiated with a 180 MeV proton beam and the radiation induced attenuation measured.

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