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.
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To protect the country that made them or most countries use it to gain more protection of other contries or to threaten other countries. :)
guns and bombs
nuclear bombs
The U.S. use nuclear bombs during World War ll to bomb Hiroshima and Nagasaki after Japan refused to surrender.
It is just one which is Japan. Two cities, namely Hiroshima and Nagasaki, were targeted by the US and were hit by nuclear bombs in WWII.