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STEP 1: THREAT IDENTIFICATION AND RATING - FEMA.gov

1-4 STEP 1: THREAT IDENTIFICATION AND RATING Explosive Blast Weapons Two parameters are used to define the explosive blast design threat: the weapon size, measured in equivalent pounds of trinitrotoluene (TNT), and the stand-off. The stand-off is the distance measured from the center of gravity of the charge to the component of interest.