Intensity levels below are estimated using a ship contamination model that is dependent on radiological decay rates and the rapidity with which hulls accumulate contamination. The decay rate of pts that was used for Operation CROSSROADS is applied in this report, but an estimated uncertainty in the exponent of 10.2 is also considered. This variation is of the magnitude that thermonuclear devices can exhibit within days after detonation. By influencing the parameter S described in Section 2, the steeper decay rate (t7 1.5) results in larger contamination doses for all ships. In all cases, the variation in dose with decay rate is within a factor of two. Also as determined for Operation CROSSROADS, saturation of ship hulls occurred within the order of one day. Estimated limits for the time to saturation are 0.5 and 2 days. For all ships, these saturation times influence the contamination dose by less than a factor of 1.5. The combined uncertainty from decay rate and saturation time, approximated as a normal distribution, is shown for each ship below at the estimated 90-percent é level. Ship - Ship Contamination Dose APACHE 0.43 + .17 rem BAIROKO 0.20 + .09 BELLE GROVE 0.24 + .12 CURTISS Q.17 + .10 EPPERSON 0.12 + .06 ESTES 0.16 + .07 LST-762 0.16 + .07 LST-825 --- LST-975 --- AINSWORTH GYPSY LST-551 - 0.27 + .13 0.31 + .12 0.21 + .08 NICHOLAS PHILIP 0.19 + .10 0.63 + .4 RENSHAW 0.44 + .3 SIOUX 0.64 * "0 155