5.2 TABLE 5.1: RELATIVE BIOLOGICAL EFFECTIVENESS OF RADIATION AND HUMAN REM ALLOWANCES Type of Radiation X rays RBE 1 Gamma rays 1 Beta particles, 1.0 meV Beta particles, 0.1 meV Neutrons, thermal, .025 eV Neutrons, .0001 meV Neutrons, .005 meV Neutrons, .02 meV Neutrons, .5 meV 1 1.08 2.8 2.2 2. 4 5 10.2 10,5 6.4 1-2 8.5 Neutrons, 1.0 meV Neutrons, 10 meV Protons, >100 meV Protons, 1 meV Protons, 0.1 meV Alpha particles, meV Alpha particles, meV 10 15 20 Human Rem Allowances Whole-body Radiation Dose Rates 0.001 rem/day 0.01 rem/day 0.1 rem/day 1 rem/day 10 rem/day 100 rem/1 day 150 rem/1 week 300 rem/1 month 25 rem 100 rem 500 rem Natural background radiation Permissible dose range, 1957 Permissible dose ranoe, 1930-1950 Debilitation, 3-6 months; death, 3-6 years (projected from animal data) Debilitation, 3-6 weeks; death, 3-6 years (projected from animal data) Survivable emergency exposure dose but permitting no further exposure for life Single emergency exposure Twenty-year career allowance Maximum permissible twenty-year career allowance From TRW Space Data, TRW Systems Group, J. B. Kendrick ed., Third Edition, (Redondo Beach, California, 1967), p. 28.
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