f. Presently installed ship washdewn systexs are effcctive in preventin: and rotieine contaninatt on ef ships due t6 fallout, but require inprevement especially te repidly refeve rela tively heevy, visible fcllout particles. * gs Ships equipped with efficient water spray systens can continue to be nenned, even after exposure te relatively heavy reclorctive fallout, without per-anent hernful effects to persennel. h. . Roar.iolo~ical defense measures, such as securing ven- tilation ané closure of the ship, “cy require (cspectelly in tropicel veters) « rocuctien in the maximum specd aveilable.. If hich specd 4s required, it mey bo necessary to eccont a” hich re-dolesical cosace for enctineering personnel whe require ventilrtion. 4. The denger of radiation burns and the difficulty ef persennel decontanination may both be reduced by reauiring that ell hands wear conpkte clothins including hate. j. The lines hose provited in the present veshtown systcn for shins is unsatisfactory because it will not withstand sufficient hi:k pressure and picks up censiceratle raciaticn centamiae tion. . we. | ¥ clecr explosions at the surfece of the ser sty ceuso large areas of tho scas surface ae much es ene huncre’ niles fren tho site of the explosion to became significantly radto- —~ active. meh of the re ddeactivity ney renein near the surface yie~16