What countries have or have use Dirty bombs?

so called "dirty bombs" cannot be built and stockpiled like nuclear weapons can. they must be assembled shortly before use. a "dirty bomb" is simply a conventional bomb wrapped in radioactive waste, the detonation of the conventional bomb scatters the radioactive waste thus making it "dirty". the problem with making a "dirty bomb" is that radiation from the radioactive waste will almost certainly kill anyone involved in the assembly of the bomb.

countries are very unlikely to seriously consider making such bombs, only terrorist groups are likely to attempt it.