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The performance of scintillation detectors with the advanced scintillator material 6Li 158Gd (11BO3)3 was compared with conventional 3He proportional counters at the IPNS spallation source at the Argonne National Laboratory, Argonne, IL. The complex neutron and gamma flux was measured with both detector types simultaneously in time-of-flight mode. Initial experiments demonstrated that both detectors have a sensitivity of about 60% for thermal neutrons. In addition, both detectors exhibited the same low gamma sensitivity.