5. Get Away
How far away is the blast zone? If you don’t have a nearby shelter to ride out the aftermath in, you must use the 10 to 15 minutes after the blast moves through your area to get as far away as possible.
Every mile you put between yourself and the blast will reduce your risk of radiation poisoning. This assumes that that roadways are clear and drivable.
Fortunately, it takes about 15 to 20 minutes for radiation to begin infiltrating an area. Feel for the wind before you choose a direction. Then, instead of heading down or upwind, run or drive at a 90 degree angle from the wind and the blast.
If you choose to shelter in place, you must wait no less than nine days before resurfacing. Of course, if you have a basement shelter in place, you probably have it fortified with enough supplies to last a minimum of two weeks.