I L 26 THE SHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD } 4 SHORT LIVED FISSION PRODUCT GAMMA RADIATION | 5 O pp “|I 2 |: | ee ee ‘ 1 i . 1 Sa ~t 19 cus s 2}. lL} ‘| Lr yey e@ PAIR SPECTROMETER Z nf” Wy oo yr . hE qt vit 1 DS | 3 5 ° . | i i ! | | \ | ' ! | my © COMPTON SPEC TROMFTER oe PAIR SPEC AIMEE A 1! I : Pv tee w'| ee ee pe we ey \ | 4 | f Vp | I | fg DECAY RATE (photons/Mev-fission-sec} g i ? " # zze = Sa 3 Mev | | I ' i patente "S900 see hay, bsir, . ‘ ° yy ial . . 5 t | Va zt oO REEL Hp : ' jen 250 sec 4, | 10 ! ae Q Mr, Sa i ! : TU 4a Soe 5 Ft z & . fi 2 E & ~y Pf | : | “i 1 ge g 27 5 & aPos z Mev io? 5 : j 2 : . soe 4 ; 2 io? j 8 " 1 a vl : ; : | tov? t 2 °5 0 2 5 10? 2 5 to? 2 t, TIME AFTER FISSION (sec) 5 10 2 5 0 Fravurs 1.—~Fiseton-product gamma-ray decay rates as a function of time after fission for siz photon energy groups. 0 10 20 30 40 PHOTON FNERGY (Mewl Fraure 2.—-Fission product photonenergy spectrum at 1.7, 10.7, 20, 260 and 1,000 sec after fission. 448029 O—58———3