Beam test of the BGO anti-coincidence shield for IBIS on INTEGRAL

摘要

ABismuth Germanate (BGO) "veto" shield surrounds on five faces the detector planes fo the IBIS instrument on-board the satellite INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory). The Veto System provides anti-coincidence signals to the two imager layers covering the energy range from 20 keV to 10 MeV. The area to be shielded is about 8000 cm~2, and with a shield thickness of 20 mm, this leads to a total BGO crystal weight of about 115 kg.