CTC 7.3, early in the operntion, institutec a system requiring units te report weekly the number of persons with eccumleted exposures in Roentzene as follows, O-1, 1-2, 2-3, 3-4, +5, 56, 6-7; 7-7.8; over 7.8.' Leter Citi. SEVEN required ‘reports ef the number of ~ersons with fceumulrted exposures, es of four dys efter efch shot, in Roontcens @s follows, (002.5, 2.5309, 3.9728, over 7.8. This neccssitated two types of exposure reports fron TG 7.3 unite. ; . Operation CaSTLE is the first instance of menned ships ro~ neinine in stonificently- ra¢ioestive wetera continuously for drys. This vrecedure was‘nocessery ta accomplish CASTLE =issione in a reasoncble tine. It wae found that ships could dteyinietinitely in weter whore redioective intensity a fow fest above the surface . wes 2nr/hr. The salt weter systens, such as evenoretors, con- densers, fire mein, atc., and in seme cases the hull, became somewhat contaminatec, but not to such a decree #s tv, in itself, expose any person to sore than 0.3 R per week. ‘Tre nishest salt weter syaten content:ztion, reported wes 100 ar per huur onthe exterior surface of en auxiliery condenser of the CUrITSS; the Jdatensity dccre:sod ropiciy with distence fron the contenser, so thet & porson steiacins wetches in the were compartcent ce this concenser received less than 0,3 R per week. Ships were sent into conteninated water areas where the intensity e fow fact vadove the surface wes such creater than 2 or/hr. In one case the water reedin= was es hich as 300 or/hr enc the ship remained Jet 14