> What increases your survival chance after a nuke?

Answer: Doing nothing.

'stay where you are, don’t try to leave your building, or leave your town — at least until officials say it is safe....

After a nuclear detonation is when the highest levels of radiation is in the environment. People who are survivors might try to go out to a hospital or evacuate the city. If that’s the case, they would increase their exposure to radiation and that’s where more deaths would occur, even more than the detonation itself....

more than 250,000 people could survive a ten kiloton nuclear bomb on a city by simply staying where they are.'

full article: (and a link to watch the CDC workshop on nuke strikes)
https://www.nytimes.com/2018/01/05/healt...nav=bottom-well