Section 2.3, the Bikini wells do not meet the practical standard, whereas wells on Eneu do. Ground-water consumption makes a small body dose. If calculated on contribution to the whole the unrealistically high consumption of 2 liters per day (6), it would amount to less than 5 percent of the total dose for Eneu or Bikini. ground-water However, the Lawrence consumption to average about Livermore team estimates 0.25 liter per day over the course of a year (6). 3.4 Permissible Soil Specific-Activity For the very low concentrations of cesium in atoll soil, it may be assumed that uptake by food plants -- and thus subsequent human --, will be proportional to soil concentration (23N). intake Turning the problem around, we may say that having found the estimated dose to be six times too high (30.8 vs. 5 rem), the island's rooting-zone specific-activity (0-40 cm depth) should be reduced to one-sixth of the present level. On this basis, the liminal specific-activity of the island's rooting zone -- that mean value (0-40 cm depth) not to be exceeded -- can be calculated for Bikini as follows: (5 rem/30.8 rem) x 28.6 pCi/g where 5 rem is current mean = 4.6 pCi/g (liminal value), the standard and 30.8 rem is the dose associated with the specific-activity of the rooting zone, 28.6 pCi/g (island distributed mean). Spontaneous decay of cesium-137 will reduce activity of Bikini's rooting zone to the liminal exactly). value the mean in specific- 80 years Or the liminal value can be produced more quickly by removing 30 cm (28 cm, exactly) of the top layer of soil (Section 2.2, Figure 4). 000025 (79.1 26