This may create a scenario that does not include the doctrine of mutually assured destruction. Therefore it would be prudent to have some sort of survival plan. The following are some actions that you can take to achieve that goal. Also the year after an attack, radiation to farm workers would be slight and crop yields would be reduced. Ozone damage would be temporary but balance would be restored.
Some vegetables are very prone to increased levels of UV light.
Fallout is dirt and debris blown up from the crater of a nuclear explosion which enters the fireball and is fused, vaporized and made radioactive. Fallout radiation cannot make anything radioactive. Fallout itself consist of sand-like particles too large to be inhaled. Dangerous amounts of fallout can generally be seen but special instruments are needed to measure the danger of radiation exposure. Radiation sickness is caused from large doses of radiation in a short period of time resulting in sickness and death.