Lethal Dose (LD) and Lethal Dose 50 (LD 50 or LD-50, or LD/50) can be defined as the median amount of material …show more content…
has a working, single approach to respond to and care for the public in the unlikely event of terrorist attacks, major disasters, and "other" emergencies. This Directive deals directly with utilizing a national approach to domestic incident management. The President directly established that the Secretary of Homeland Security be the chief Federal official regarding national incident management. Reading through PD-5, it is my opinion that the Directive focuses primarily on terrorist activities/attacks, however, this could easily apply to domestic nuclear incidents such as reactor meltdowns, Broken Arrows, lost weapons or all-out nuclear attacks on the