If memory serves, the 9500 compensates for insufficient light by automatically increasing the ISO setting (this is to make up for not having a mechanical  'image stabilisation' or 'anti-shake' as much of the competition has).

If I am right, the grain comes from the fact that your pictures were actually taken at much higher ISO settings than you thought you were. You can check this by looking at the pictures' EXIF files and checking ISO settings.

http://www.dpreview.com/reviews/fujifilms9000/

Charles

Charles