two possibles
I read a Article were a nuke planner produced [In Fun] a map giving 95% of Britian a 5% rise in per captia Wealth- by nukeing the other 5%.
Given the number of and type of, Nukes avalibile in 1962, and the probable '62 targets. You have to seperate the phisyical damage, from the Social & cultural Damage. I'd give the phisyical about 40 - 50 [ there are trees growing at Ground Zero, White Sands, in the 1980's] years,
In Concidering this Remember
1-in 60 years of testing for, there has been no large rise in mutation rates, or in other really long term assignable health problems.
2- Fort lauderdale is 20 miles from Miami, Allentown is 20 miles from Pittsburg, But the effect on either town, of bombing, would be vastly different.
The Social & Culture effects, would be more damaging, I'm not even sure if your 140 is long enuff.