"You got it," Klein affirmed. "Plutonium is a lot more 

dangerous 

as a terror weapon when used as a poison rather than as bomb fuel."

Please, no.

The idea that plutonium is that poisonous usually comes from 

anti-nuclear

propaganda.  Putting it in the water is particularly silly because 

plutonium,

when eaten, is many times less poisonous than inhaled.

Ah, yes. Plutonium ingested IS that poisonous. I used to work with such
things, and messing with plutonium, however infrequently and in 

extremely

small amounts, still scared the crap out of me.

Around eleven tons of it was put in the atmosphere by 1950's nuclear 

tests.

We're still around.

11 tons, world-wide over a period of time, is nothing.  "dilution is 

the

solution," so the trade-saying goes, and that's most certainly 

dilution.

Actually, plutonium is *the* most toxic substance known to Mankind. Only 
one microgram is needed to kill a man. Just to give you an idea, one 
microgram of water is a cube of water measuring one one-hundredth of a 
millimeter on an edge, and plutonium is twenty times as dense as water. 
A piece of plutonium the size of an asprin tablet would theoretically be 
capable of killing the entire city of San Francisco.
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