If the images are in iPhoto for iOS use the Share to iTunes feature. Then connect your iPad to the computer you normally sync with, open iTunes, select your iPad in the left column of iTunes and in the right column select General. Ten scroll down to find the File Sharing area and select iPhoto. You will see a pane where your photos are listed and you can copy them to your computer. I'm not completely sure the copies will be RAW files but at least you have saved a version of the photos.
I use my iPad to review, display and post photos but I use my computer to actually process RAW files. While I often connect my camera to my iPad to transfer photos I never delete them from the card and ill eventually copy them to more than one hard drive.