Spankey on 23 March 2009
If you've killed Fawkes, you're pretty stuffed.
AFAIK, Fawkes is the only char able to take the rads to get the device.
edit: maybe this can help you, I haven't confirmed the method myself though
http://www.gamespot.com/xbox360/rpg/fallout3/show_msgs.php?topic_id=m-1-46562731&pid=939933
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