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From: J. D. Teresi and C. L. Newcombe, "Calculations of maximum permissible concentrations of radioactive fallout in water and air based upon military exposure criteria," Health Physics 4:275-288, 1961.

 Table 7: Maximum permissible concentration (uc/cm3) in water and air of radioactive fallout for five exposure times (n) at eleven different times after burst to deliver a dose to the critical organ of 150 rems in 30 days (t)* n Exposure Time after fission 3.5 hr 12 hr 1 day 2 days 4 days 7 days 14 days 28 days 105 days 210 days 365 days 1 Ing.Inh. 274.1 x 10^-3 8.51.3 x 10^-3 5.17.7 x 10^-1 3.04.5 x 10^-1 2.02.8 x 10^-1 1.41.9 x 10^-1 0.781.0 x 10^-1 0.839.8 x 10^-5 1.21.2 x 10^-1 1.31.2 x 10^-1 1.11.2 x 10^-1 7 Ing.Inh. 5.98.6 x 10^-1 1.92.8 x 10^-1 1.11.3 x 10^-4 0.638.0 x 10^-5 0.405.6 x 10^-5 0.263.7 x 10^-5 0.141.8 x 10^-5 0.141.7 x 10^-5 0.182.0 x 10^-5 0.192.0 x 10^-5 0.151.9 x 10^-5 14 Ing.Inh. 4.37.2 x 10^-4 1.42.3 x 10^-4 0.781.3 x 10^-4 0.435.3 x 10^-5 0.273.8 x 10^-5 0.182.5 x 10^-5 8.8 x 10^-21.1 x 10^-3 8.7 x 10^-21.0 x 10^-5 0.121.1 x 10^-5 0.101.1 x 10^-5 7.9 x 10^-21.0 x 10^-5 21 Ing.Inh. 3.75.4 x 10^-4 1.21.8 x 10^-4 0.679.7 x 10^-5 0.385.5 x 10^-5 0.233.3 x 10^-5 0.152.0 x 10^-5 7.3 x 10^-29.8 x 10^-6 6.8 x 10^-28.6 x 10^-6 8.1 x 10^-28.9 x 10^-6 6.6 x 10^-28.6 x 10^-6 5.2 x 10-28.7 x 10^-6 30 Ing.Inh. 3.65.4 x 10^-4 1.11.7 x 10^-4 0.628.4 x 10^-5 0.345.3 x 10^-5 0.212.8 x 10^-5 0.142.0 x 10^-5 6.8 x 10^-29.2 x 10^-6 6.0 x 10^-27.9 x 10^-6 6.3 x 10^-27.7 x 10^-6 5.1 x 10^-27.1 x 10^-6 3.8 x 10^-26.4 x 10^-6 * Ing. = ingestion; Inh. = inhalation