Visual inspection

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  Fig. 4 Broken glass

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  Fig. 1 Colored lead glass module, possible radiation damage issue. Can be seen without removing steel flange.

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  Fig. 2 Colored lead glass module

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  Fig. 3 Wrapping issue: teared Aluminized mylar, fix without disassembling module

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  Fig. 5 Damaged PMT

Possible issued with lead glass module

1. Broken lead glass, see Fig. 1 (module taken from the FCAL prototype)
   • some problems can be seen when looked on the lead glass block from the side opposite to the PMT
   • lead glass module has to be disassembled
2. Issues with wrapping
   • small damages (holes) of the Aluminized mylar, See Fig. 2. Can be fixed using Al sticky tape, thickness < 20 um
   • Problems with the Al layer in the wrapping foil:
     • Al layer peeled off resulting in some transparent holes in the wrapping.