Hi Jacob, A couple of years ago, I put together a list of papers that touch on radiation damage: http://www.p212121.com/2009/11/17/ultimate-list-on-cryocrystallography-radiation-damage/ To answer your question more directly - see pg. 40 of the following paper: http://www.px.nsls.bnl.gov/courses/papers/Thiel-Garman2006.pdf I hope it helps! Take Care, Sean P212121 http://store.p212121.com/