Global Deactivation or Radiation Corp. (GDR), 2001. Gamma Illness- gamma    radiation from airlines and space missions, (no author), accessed 3/28/05 http://www.gdr.org/gamma.htm. Health Physics Society, 2004. Radiation basics.  (no author), accessed 3/8/05, http://hps.org/publicinformation/ate/faqs/radiation.html, MacLean, VA. McCormick, J.F. and R.E. McJunkin. 1965. Interactions of gamma radiation and other environmental stresses upon pine seeds and seedlings. Health Physics 11:1643-1652. Roberts, W.T. and J. O. Weese. 1998. Gamma Radiation Effect on Vitamin B6 Content  in Ground Beef Patties. Institute of Food Technologists, 1998 Annual Meeting, June 20-24, Atlanta. University of California-Santa Cruz, Environmental Health and Safety Department, 1998. Radiation Safety. (no author), accessed 4/3/05, http://www.ehs.ucsc.edu/rs/RAT/ppt/sld017.htm, June.