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 t7!-3 that was used for Operation CROSSROADS is applied in this report, but an estimated uncertainty in the exponent of +0.2 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 level, Ship Ship Contamination Dose APACHE 0.43 + .17 rem BAIROKO BELLE GROVE CURTISS EPPERSON ESTES AINSWORTH GYPSY 0.20 + .09 0.24 + .12 0.17 +.10 0.12 + .06 0.16 + .07 0.27 + .13 0.31 + .12 " LST-551 LST~762 LST-825 LST-975 NICHOLAS PHILIP RENSHAW : 0.21 + .08 0.16 + .07 Fe --0.19 + .10 0.63 + .4 0.44 + 3 SIOUX 0.64 * ° 155