UNCLASS wiED prestmes entry into an invisible cloud or a fall-out area. For HOW plus 12 and later cloud trackers contact with a low intensity invisible cloud has been authoriced in the total allowance exposure of 100 milliroontgens is not exceeded. 19 April 1948 Fran: CUTF-7 Action: All Task Group Canminders Info: Porsonnel of Task Group 7.1 will be allowed to work on Engcbi in the area in which radiation intensity is less than 12.5 mr/hr for a period of 8 hours unaccompanied by a monitor in accordance with the following procedure: CTG 7,1 will be notified daily by CTG 7.6 as to the extent of this area and CTG 7,1 will inform all Tt 7,1 working parties, who can accomplish their work in this area, of the extont of the area, CTG 7.6 will insure that there will be at least one mqnitor in this area to advise all individuals working under the above provisions, CIG 7.6 will provide for issue of film badges, pocket dosimotegs and clothing as necessary at the landing area on Ingebi. Upon returning all working parties will stop at the BAIROKO as it is not feasible to monitor personnel for contamination on Engebi due to hich background. 20 April 1948 Fron: CTG 7.06 Action: CJTF.7 Info: Perimeter island survey comploted, Recanmend long term closure of islands from Yeiri westward to southwest passage inclusive. These islands radioactive along beaches and in same cases show strong fall-out. Recommend temporary clearance of all other perimeter islands subject to routine checks. Recormend swimming permitted only on lagoon beaches of eastern islanis. All islands are evidently subject to contamination by flotsam including dead fish and in same instances highly radioactive mterial. 3 May 1948 Fran: CJUTF-7 Action: CTG-7.7 Info: CTU 7.6.1/CTG 7.6 Sam a oe