VX is a Binary round. Meaning the round needs to be fired <usualy another safety, it needs to be fired and spin X number of times to fire> Binary, the round usualy needs to spin to mix the chemicals to make it active.
As for the radius, unless there is a strong gale going on most folks in the immediate area are TOAST!!!! Remember the concusion and shockwave of your explosion is going to disperse the chemical <if it worked at all> Even people and things up wind.
Nerve Agents are a contact weapon, they are normaly in a oily liquid form. Again with the explosion they will do up into the air and come down in a mist as well. And really contact with the chemical is fatal in the T2K world. The Tupamchloride is a concentrated form of valium, it is used to keep the patient immobile hopefully they won't convulse to the point they break bones and dislocate joints or cause other injury. And then of course the toxin and its affects on the nervous system which will basicaly cause them to STOP WORKING!
I would say and this is a basic idea everything within 1km is going to get a dose.
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