Tender For supply of plastic scintillatordetector assemblies - bc 408 50 mm diameter x 70 mm assembly with r6231 pmt , bc 408 60 mm diameter x 70 mm assembly with r6233 pmt , bc 408 50 mm diameter x 50 mm assembly with r6231 pmt , bc 408 hexagonal disk bare crystal , bc 408 50 mm diameter x 50 mm length non wrapped bare crystal , black wrapping tape