HEADQUARTERS JOINT TASK POBCE SEVEN Washington 25, 2. C. - 46/729.32903 4 May 1953 SUBJECT: Lagoon Contamination and Health Hazards During Operation CASTIE TO: Commander Taek Group 7.3 . “Ashington 25, D. ¢. 1. References. a. Letter, J-16941, TC 7.1, subject ag above, 22 April 1953 b. Memprandua for Reserd, JTF SEVEN (Ine. 2), 6. Draft of Madlologieal Safety Annex to JTP SEVEN Operation with twe inelosures (Inel 1). Order 1-33 (Inel 3). 2. Reference la outlines technical details expected to influence surface operations in the Eniwetok and Biiciad lagoons following contasie nating nuclear events; referenee lb outlines some of the operational sa= pests of such activities dnd indicates the scope of discussions mich have taken place to date. Referense le delineates proposed opersticnal clearance limits for Operation CASTLE and is included for its particular iapast on ship and boat opcretions. 3. The above roferences indicate the current status of suveral preliminary etadies of the problem of wator surfaac operations in tne presonee of radiclogical contamination. I8 is desired that your nead quartere takes astioa as follows: @ aw Roview rofaronee ls and eubait coments or rocomendtions consistone with the philoecohy of “operational necessity" and "caleulate riek* inherent in the over-all aission of tne Joint Task Force. Be Initiate studies to determine acthods of provanting coneca: tration of radiological contamination in water ovaporators, distridutios linos and aisrcorganie growths on the boctoa of ships. @. Reccamend a date for a con srance with this hocdcuartcors on the owermall aspocts of tho lagoon ecntamination problem This ccn= forence should take plaee as soon as possible after the issigient aft Inel 1 to TAB RS fg |