Radioactive isotopes getting into the food chain would be a far greater problem than direct exposure to radiation because they're bio-accumulative. Alpha and Beta radiation may be pretty harmless outside of the body but when taken internally in the form of radioactive isotopes they can be deadly.
nice to see somebody making sense for a change, well done jones.
what most of you fail to appreciate is that the earth is made up of biosystems, all of them interact with each other, making the earth one big biosystem. fuck up one bit, and the rest will be fucked up to some degree in various ways. the more bits get fucked up, and to a higher extent, the more fucked up everything gets, and if enough parts of the system get fucked up, then fair enough, the earth carries on, but it becomes uninhabitable for a lot of its previous inhabitants, of which our species is probably one.
remember that the bacteria and cockroaches are not the targets of a nuclear war, humans are, that's why humans are likely to fare worse than bacteria and cockroaches.