radionuclides which was a very unrealistic 1.27 x 106 rem. When the marine transport model was applied in calculating the infinitetime doses for the remaining 47 radionuclides, the sum of the doses was 0.628 rem. The sum of the 47 radionuclides plus the sum of the doses from the previously considered 53 radionuclides was 1.52 rem. A list of the radionuclides considered in these calculations and a summary of the results is given in Table 1. As the dose contribution calculated for each individual radionuclide is classified, it cannot be listed here. The actual internal radiation dose that would result from an underground nuclear detonation with this particular type of device and assumed redistribution of radionuclides (by venting and groundwater flow) obviously would be considerably lower than the 1.52 rem computed by these conservative calculations.