“Dirty bomb is the problem. Not a nuclear reaction. A small military drone could carry enough to ruin the Thames River”
If they use something like this, I predict that it will happen only one time.
I’m surprised we have not seen it yet. But the terrorist do not need radioactivity. 10 lb of mercury (about a pint) would contaminate 1800 acre feet or drinking water or about 2.3 billion liters. Drones are a serious safety problem because a 10lb payload flying 1000 feet above security fences and guards adds a new dimension to domestic terrorism.