[HiTech RedNeck]

Isn't a plutonium bomb much dirtier than a uranium bomb as well, due to the extreme toxicity of the part of the plutonium which doesn't explode but gets scattered instead? Sorry about omission in earlier post

[Dan Day]

Isn't a plutonium bomb much dirtier than a uranium bomb as well, due to the extreme toxicity of the part of the plutonium which doesn't explode but gets scattered instead?

Actually, the radiation of the scattered "unused" plutonium is negligible compared to the amount of radiation generated by the fission products.

An unexploded (or scattered) plutonium bomb consists of 300-600 Curies. But the amount of fission products from a 1kt detonation are (the list is only partial):

160,000 Curies of Iodine-131
38,000 Curies of Strontium-89
190 Curies of Strontium-90
200 Curies Cesium-137
15 Curies of Carbon-14

But that's only the near-term story. Plutonium has a (far) longer half-life than the fision products, which means that after sufficient time has passed, the residual Plutonium will continue to be a lasting radiation threat even after the fission products have decayed away to unremarkable levels.