Gamma exposure rate (mR/h) 100 - 10 Gamma doserates three feet above ground on island of Rongelap. ed ——=— Theoretical decay according to (time) )-4 (starting D + 1 days). eoscsers Estimated from relative theoretical gamma _-: dose rates, decay rates of fission products, energy of the gammas, and the number of gamma photons -.-per disintegration. 0.1 7 i | 10 100 Time after detonation (days) 221 -— 1000