[quote=@Isotope]
You don't have to make it a lethal dose, you'd still cause light rad poisoning and cancer for all the villagers to go with their birth deformities.

That said, can we not have radiological weapons?  I mean, smashing a nuclear reactor into something with a huge warhead behind it is pretty serious and would spread radioactive material everywhere even if it wasn't a proper bomb.  I mean there comes a point where you can just have your weapon spew radiation everywhere like an advanced dirty bomb, making the whole no nukes thing null given we were trying to avoid WMD's in general with the policy if I recall.

Up to Sigma tho.
[/quote]Dirty bombs are neither that lethal nor anywhere close to an actual WMD. If you wish to kill as many people as possible by effecting their biology, toxins and pathogens are still your best bet. Even then nerve gases are hardly economical for such things and actually quite easy to protect against.

While it's a bit more problematic to defend against radioactive pollution it's also far less effective. Generally unless you rack up a huge amount of them to one place it would only effect you through skin contact or ingestion.
Even if a nuclear bomb would accidentally fall on the road next to your house at best you need ask your neighbors to take you in until the cleanup arrives. Radiation does not spread far without some medium carrying it away. And even if it's spread you need considerable amount of it to be anywhere close to dangerous via skin contact, far more so if you want it to endager the target by just being within its vicinity.

For all purposes dirty bombs are more like terror weapons rather than anything effective. Poison gas is kinda the same, especially when the target is at least remotely prepared against it but at least they can be far-far more lethal than radiation. They also cause far worse deformities.

So yeah, a missile with radioactive trail might be an environmental concern, even more so if the missile crashes into the water supply. But thinking those as their main effect as a weapon is a big fat joke. They only terrify people who have no idea how these work.
Again, they can be dangerous and have negative environmental effects. But so is firing lead bullets.