These are shown in Tab B, Appendix III. All parts of the TAKUYO continued to be washed and rinsed each morning until reaching Rabawl at 0900 hours JST, 19 July. Decontamination of the TAKUYO personnel was also commenced on 15 July on advice from Tokyo. Men were directed to shampoo and shower, and the clothing of the crew was washed and monitored. On arrival at Rabaul, each crew member was given a haircut. The SATUMA did not encounter rain (position 151° East and approxiTH mately West of the TAKUYO) and the officers routinely monitored their radiation level using their geiger counter and dosimeter. By this means they felt assured that the SATUMA had not encountered fallout radiation and was not contaminated, No decontamination measures were instigated. On arrival in Rabanl, the ship was monitored, using the TAKUYO scintillation coumter, and the Captain advised us that all readings were at background levels, Monitoring was done on 18, 20, 21 and 25 July. Swipes were als taken on the SATUMA using ordinary checmical filter paper with an area of 4.9 square centimeters and swiping a 100 square centimeter area, The swipes were ashed and counted, using the geiger counter. The monitoring and swipe results are given in Tab B, Appendix IV. D. RADIOLOGICAL SURVEY OF SHIPS Two Beckman MX-5 (Serial Nos. 1146 and 65014) geiger counters ani one Chatham CDV-700 (Model 3, #6306) geiger counter were used to establish background radiation readings in Rabaul. These instruments were calibrated the day prior to departure for Rabaul by Task Group 7.1 ad Task Group 7.5 Rad-Safety organizations. brations were confirmed. On return to Eniwetok the cali- A background dose-rate reading, taken at 2200 ~~me QRRE ES CONFIDENTIAL rere a DOE ARCH ven 29