Can anyone point me to some raw Galileo images that have significant radiation noise (pixel hits)? All the ones I can find have been processed.

Just look at any close-up Io image. Let me know how many you need and I think I can quickly fire those up.

Here are a few of mine that have only light noise removal. These definite should show what you are looking for:

http://pirlwww.lpl.arizona.edu/~perry/io_i...3ISTOPMAP05.jpg
http://pirlwww.lpl.arizona.edu/~perry/io_i...5ISGIANTS01.png
http://pirlwww.lpl.arizona.edu/~perry/io_i...ERM__01-Zal.png
http://pirlwww.lpl.arizona.edu/~perry/io_i...__01-Hiiaka.png
http://pirlwww.lpl.arizona.edu/~perry/io_i...2ISTERMIN01.png

These definitely show off the fact that the top of the frames tend to be less noisy than the bottoms. This is due to noise added as the image was being readout from the CCD. The image is readout from top to bottom, so the bottom is exposed to the radiation environment longer, so appears to be noisier.

OT, Jason, but I noticed on the upper left mesa in the '01-Zal' image what looks like the first impact crater I've ever seen on Io! Has it been identified as such?

No, I remember seeing that way back when [http://members.fortunecity.com/volcanopele/crateratzal.htm ; please excuse the garish presentation, my web skills and netiquette weren't as developed back in 2000]. More thank likely that's a depression formed from explosive sapping along the base of a scarp on that mesa.

Hm...Would using a pushbroom imaging chip reduce the side effects of radiation noise on the images? I guess not, if the integration time has to be the same across the chip to match, each pixel gets the same amount of time in the "hot" environment. But, if you added extra sets of CCD's, hot pixel rejection can be done in the instrument to remove the cosmic ray hits. Sounds like a patent in there somewhere.