Table 1. Summary of System Efficiency and MDLS for Field WBC System 1376, 60-, 40, Energy Efficiency MDL Time 662 Kev 1173 & 1334 Kev 8.7 x 10° 6.7 x 107° 37 Bq (1 nCi) 37 Bq (1 nCi) —-900 sec —-900 sec 1460 Kev 7.0 x 107° 222 Bq (6 nCi) 900 sec 12 oe Nuc lide