Habitable Moons
Hi Board
Sky and Telescope did an article on habitable moons not so long ago. Such are more likely now that a few Jovians have been found within the HZ of their primaries.
On the issue of radiation belts - well since Jovian radiation peaks in the MeV energy range while cosmics peak in the GeV and higher range, and our atmosphere does a good job of reducing cosmic radiation, I'd say a rad-belt is a non-issue.
Also any moon that keeps an atmosphere will have a decent magnetic field, which quite effectively protects the Earth from the solar wind. All the Galileans seem to have fields of their own - Io and Ganymede seem to even have fields internally generated rather than merely induced - so I'd say fields seem likely.
Adam