To deal with the zombies in the city, one should either avoid disturbing them altogether or use intense and concentrated firepower to annihilate them, with nuclear bombs actually being the best option.
In fact, a fully detonated nuclear bomb, especially a hydrogen bomb, leaves little residual nuclear radiation after the explosion. The Soviet Union used nuclear bombs to extinguish fires and to create artificial lakes, without leaving behind much in the way of serious consequences.
The prolonged nuclear radiation actually comes from incomplete nuclear reactions or, simply put, from dirty bombs that failed to detonate fully, or from nuclear power plants.
If Gao Yuan weren't worried about the reaction of the Serpent People after using nuclear bombs, he would truly suggest that Ram just level Malakal with nukes. Keeping the city wasn't important, but leaving the zombies and monsters in it was ultimately a risk.
