APPENDIX Ideally, an abundance of shipboard radiation measurementsis available to define the topside environment. Where such data are lacking, auxiliary information is used, through appropriate conversions, to quantify topside intensities. The radioactive decay function described in section 2 is an example. For those ships totally lacking intensity readings, the land-equivalent radiation fields depicted in Reference 2 for fallout deposited on Bikini Lagoon provide readily convertible substitutes. The intensity curves depicted for all ships in section 3 do not include the transient contributions from shine. Aside from water shine, which is addressed in section 2, exposures occurred from proximity to contaminated vessels. As those vessels were often of unreported intensities, the foregoing approachis used for them as well. Intensities on contaminated ships differ from land-equivalent intensities because of the limited extent, flatness, and nonporosity of ship decks. Conversion from land to ship levels is facilitated by a radiological quantity that is invariant to these differences, the surface activity per unit area. That quantity has been related to land intensity in Reference 18, and is related herein to all required ship intensities, through numerical methodsof radiation transport. These calculations convert surface activity to intensity (peak or average) on a ship of specified dimensions, and to the associated shine on a proximate ship of specified dimensions and separation. The calculated ratio of shine to source vessel intensity, or shine factor, is confirmed for one ship configuration by the available data. The radiation transport calculations assumeideally flat, rectangular deck surfaces with a uniform distribution of surface activity. Gammaintensity is calculated at points 3 feet above the deck through a spatial discretization of the radiation source. While the peak intensity is found through the summation of all contributions to the center point, the average intensity involves a double summation. This amount of computationisfacilitated by applying radiation transport at a level commensurate with the accuracyof the underlying parameters. The unscattered photon flux, with a l/e attenuation length of 300 feet in air, is computed to a satisfactory resolution for the geometry involved. This provides time- and cost-effective solutions that are reasonableforline-ofsight exposures for variously positioned ships. Ship dimensions are based on information in Reference 17, which applies to the specific ships in this report or to vessels related by type and class; however, estimates are required for the barges. The approximated dimensions used in the calculations are: COCOPA, MOLALA, 111