8 91 2 3 4 5 6 7 891 2 3 4 $$ 6 7 891 =~ ~~ na oo oom lUmOUCOO ou ew oO ENERGY FLUX — - GE wwoe 7 Ow wo 6 2 3 4 5 6 78930 4 5 6 7 B91 1 ENERGY (MeV) Figure 2. for three Differential energy spectra of the scattered energy flux source energies shown for comparison, alr medium. at heights of 1 and 100 meters for a (flux x energy) soil-air medium. Also is the spectrum at 1 meter for a 1 MeV source in an infinite