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Larry, yes we do know each other from the C&R FFL eList.
KODoc, I hope you are near the NY border then, because Eastern CT is a major target re "nuclear facilities"!
To another poster who asserted that most of the radioactive material would "disipate" within 2 weeks: As I recall it (subject to correction), the radioactive fallout hits the ground and continues to pollute the ground and water supplies it doesn't just "disappear"! That said, it means that water, plants, and animals (they eat from the ground) would continue to spread contamination which would likely result in nasty bouts of radiation sickness and death for many months/years after the event (large scale nuclear attack). That's why I said that I'd rather be under the first shelling than try to survive only to die an agonizing slow death.
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A nuclear detonation from a weapon is vastly different in mechanics and results from a nuclear plant meltdown like what happened at Chernobyl.
The fallout from a nuclear detonation doesn't dissipate because it's getting absorbed by the environment.
It dissipates because it's simply no longer radioactive.
Very, very little nuclear weapon fallout is from long term isotopes, i.e. naturally radioactive materials.
The vast majority of the fallout that is produced from a nuclear detonation is from naturally non-radioactive ground debris that has been heavily bombarded with gamma and neutron radiation from the nuclear fireball and initial blast pulse, and then disbursed over a wide area in a dust plume. A typical example of this would be dirt and vaporized concrete scooped up from the crater of a ground burst against a hardened target like a missile silo.
This material isn't naturally radioactive and will not stay that way for any great length of time. The vast, vast majority of it will lose about 99% of it's radioactivity within approximately 14 days.
The naturally radioactive materials are usually from the vaporized bomb materials itself. After the bulk of the fallout sheds it's radioactivity, these isotopes can then be located with a Geiger counter and then isolated for disposal.
After a strike, virtually all of your radiation exposure will be from the fallout. To get a lethal dose of radiation from the initial pulse of a larger, thermonuclear warhead that would be used in a strategic attack, you would have to be so close to the fireball you would be incinerated, which means you'd have to be relatively very close to the target itself.
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