30 THE SHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD DECAY RATE photons/fission- sec} PHOTON INTENSITY (photons /Mev-fission-sec) _ SHORT LIVED FISSION PRODUCT GAMMA RADIATION ahem bo REE Pb ld te. * PHASE ! OF EXPERIMENT 1 © PHASE 2 5 10 2 5 1 . . J] OF EXPERI ENT ] 4 31 # 108 2 rT, TIME AFTER FISSION (sec) tye § 108 2 5 1o4 Fraure 6.—~Decay rate of fission product gamma rays for 0.28 to 6.0 Mev energy range with superimposed points from energy spectra study, r ! ' 0 t 2 3 4 PHOTON ENERGY (Mev) 5 6 Ficurs 4.-—Fission product photon energy apectrum with superimposed spectrum from time decay study. I