Re: The detritus civilisations leave behind
"This might be made more complicated if they set off salted bombs "
Salted bombs are more-or-less a way of ensuring that an area is uninhabitable for decades/centuries.
I suspect that they're more of a science fiction plot device playing on unreasonable fear of radiation than an effective one. Little Boy had around 40kg of uranium. Only 0.7g was actually converted. The rest was vaporised and dispersed on the wind, which is what would happen to anything like cobalt unless you used several tens of tons of it and that's kind of hard to mount on the end of a missile or carry in a bomber.
Biting the hand that feeds IT
