for completely ship-based recovery operations together with the necessary n-ldcopter services, It further provided for the basic radiological cz eciBarked task foree personnel during periods afloat. safety in addition, 2nd inasmuch as TG 7.3 had a prime intesest in the post—ahct contaminaticn satus of the lagoon, the Radsafe unit of this group was dirocted to propare hens for lagoon water sampling by helicopter and emall craft. Samplos sollected in this mamer were analysed by the TG 7.1 radsafe laboratory and the results used by the task force headquarters initially for re-entry do- cisions, by TG 7.3 for continuing ship operation in the lagoon and by TC 7.1 in scheduling recovery ani make-ready operations. (4) Task Group 7.4. The unit of this group, with the assis— tance of interested scientific project perscanel of TG 71, was charged with the radiological safety of the aircraft cloud sampling program. Over 5 period of operations both at the NPG ard the PPG, procedures and oquipment hadbeen developed to cope with the wrusual problems involved in cloud sampling. CASTLE, however, presentod a more ccaplex problem dus to the large number of high yield events ami due to a plan for early (H plus 1 to H plus 2 hour) low level (10,000 to 20,000 feet) special sampling by W8-29 aircraft. Further, since the Air RAOEX was of primary interest to the air Task Group, the responsibility for preparation of this AADEX was given to TG7.4. Ace tually, the TC 7.4 tecknician involved worked physically with the Radsafe Office st the task force comand post, and with the TG 7.4 Air Operaticns Center, in prepering the RIDEX which was ultimately put out to sll task groups as a task force directive. In additinn to the above, TG 7.4 was charged with the necessary aircraft operations involved in the conduct of the task force cloud tracking plan.