I find that reading about nuclear accidents actually helps here. Assuming you’re not standing next to something unbelievably “hot” (don’t do that!), the main is

I find that reading about nuclear accidents actually helps here. Assuming you’re not standing next to something unbelievably “hot” (don’t do that!), the main issue is the dust that tends to settle onto everything and keep irradiating you. So radiated food is fine, but food that’s been coated in radioactive dust is emphatically not fine.