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[Star Wars] Why weren't the clone troopers killed by the radiation of starship engines they were standing behind?

Hey all,
Why weren't the clone troopers killed by the radiation output of the starship engines  they were standing behind as seen near the end of Episode II  Attack of The Clones? Given the exhaust from the ion drives used by starships  is radioactive.
gpt
Snappy answer: nor is anyone ever burned by the hot exhaust... The *Falcon*'s main thruster doesn't even burn a cloth stuck into it.

Even snappier answer: unless they got hit with over 40 Grey, they wouldn't just drop dead; below 8 Gy, it would take 10 minutes or more for the neurological symptoms to manifest. It would take a while to feel the prickling on the skin and the metallic taste in the mouth in the heat of battle, and they can't see the "radiation suntan" through the helmets.

Explanation: energy shields on the ships.