ee te ae a ce ee ee et ee _ ee ee ee ee DNA 1240H-2 19 August 1973 Underwater Bursts Initial radiation from underwater bursts is not considered a personnel hazard. Residual radiation is emitted at a high level from radio- active particles in the base aurge, the water pool, and the foam produced by underwater bursts." A radioactive base surge rainout may also occur, depending on meteorological conditions. Topside personnel could receive exposures from above-surface formations that would be in the moderate or emergency risk categories of the CDC criteria, even though the ship itself was sufficiently far from surface zero to suffer no serious damage. The «DAEDALUS computer program (Schuert, Killeen, et al.) will calculate ex- * posure rates and total exposures from the base surge and the water pool, " for times up to 30 min after burst. However, the yield range is limited to bursts between 0.01 and 150 kt. If the base surge entered ventilation ducts or any break in a ship's weather envelope, radioactive particles could settle out and create @ continuously emitting radioactive source below decks. Adverse effects on personnel would occur, but only after a period of time that would be long in relation to a particular tactical situation. 18.7.4 Summary BE ST AVAILAB)F Copy Environmental conditions and tasks of shipboard personnel exposed to thermal and nuclear radiation from water bursts differ from those of * “Young has categorized underwater bursts by burst depth for yields between 1 and 100 kt and has described differences in the phenomena pro- @Guced in each category. Different above-surface formations result in differences in emitted nuclear radiation. wow. 18-32