5.6.1.3 Maximum Annual Dose. The dose rate is not constant during the 30-year period for which "veneration’' doses are calculated. Consequently - the maximum annual dose during this period is calculated for comparison with the annual exposure guidelines recommended by the AEC. The internal dose rate is dependent on the particular radionuclide as well as its retention characteristics within the body. Consetuently, the time dependence and the point in time of the maximum dose rate is ’ different for each combination of radionuclide, environmental pathway, and target organ for which the dose is being-calculated. . Because of uncertainties inherent in some of these time constants, the internal con- ‘tribution to the maximum annual dose rate is the sum of the individual maxima disregarding their separation in time. This results in a slightly conservative estimate of the maximum annual dose. The times of these maxima are shown in Table 5-11. As discussed in Paragraph 5.6.1.1, the maturation time for pandanus, breadfruit, and coconut trees is taken to be 8 years for simplicity. are then adjusted: accordingly. The maxima for these exposure pathways The external dose contribution is simply corrected for its radio- logical decay with no credit being assumed for any weathering, erosion, or other natural processthat might increase its rate of disappearance. The sum of the internal and external contributions represents the total of the maximum annual dose. The results are presented in Table 5-7. Referring to Case 1 in Table 5-7, higher maximum annual doses could be estimated as shown in.Table 3 of the AEC Task Group Report. However, these higher doses represent highly unlikely living patterns and, even if included, would only have increased the unacceptability of this case. 5.6.2 Comparison of Risks for Alternative Programs Each alternative program considered for cleanup and habitation can be associated with a level of radiological risk for the people of Enewetak Atoll. A semi-quantitative measure of this risk is provided by estimating the number of health effects* expected from the radiological exposure in each alternative. The risk criteria given in Table 5-1 are used as the basis for making these estimates, assuming a total atoll population of 1,000 receiving the 30-year integrated doses given in Table 5-6 for each alternative. Table 5-12 lists the estimated health effects. *As indicated in NCRP Report No. 43, Review of the Current State of Radiation Protection Philosophy, January 15, 1975, it is very unreasonable to interpret these upper limit estimates as actual risk. i Because of the extreme conservatism in these estimates, they should be used only as general guidelines in any risk analysis. . vw