[2 Kool 2 Be 4-Gotten]

One scenario that has been tossed about is a radiological or "dirty" bomb detonated on a ship within the Persian Gulf. The implication is that you would shut down that waterway for decades. Whether that is true from a technical point of view, I can't say, but the Gulf is most certainly a choke point.

[Britton J Wingfield]

A dirty bomb in the gulf wouldn't shut it down for very long at all. Currents would sweep away the crud in short order.