about if a "dirty bomb" goes off near you, or a nuclear  plant(electricity) 
gets hit?!  I do
believe that CS in itself would not suffice.  I'm aware that  Potassium 
Iodide is a must
if one lives near one of these plants, but no where in Miami do they  sell 
such, although
I know one can purchase it on the internet.  In Europe they give  to their 
people who live
in near proximity to a plant.   Pete