Israel Could Use A “Dirty Bomb”?

David Rothkopf just made me sit up straight:

[W]ithout special munitions that can take out deeply buried targets in Iran, countries like Israel might be forced to use weapons that could make the sites uninhabitable, such as radiological (rather than nuclear) devices.

Could this be a future Netanyahu gambit: give us the conventional tools or we will nuke ’em?

(Hat tip: Crowley.)