MEMORANDUM FOR: SUBJECT: CJTF SEVEN Report on “Soil and Water Sampling Mission 1. In compliance with your oral instructions, tho undersigned visitcd Wot jo, Erikub, Maloolap, Wotho, Majuro Atolls in the Marshall Islands 5 through 7 March ~ 1954 for the purpose of obtaining carth and drinking wator samplcs, and of moasur.ing gamma ray dose rates, and also checked the radiological condition of the S.S. ROQUE on its arrival at Majuro 7 March 195k, 2. The first four atolls were visited by Marshallese intcorpreter Takushi and the writcr by means of an UF-1 amphibious aircraft. Majuro was reached by C~47. Erikub might have been omitted sinco it was not inhabited, being property of the Wotjc tribo which goos there only occasionally to gather copra. (This was we unknown until after the visit.) 3. At cach atoll, oly the principal inhabited island was visited, At cach visitod island an cffort was made to compose a reproscntative soil avcrage by collecting into a single containor scvcral samplcs, cach approximtcly one squar+ foot of arca and one inch depth, sources currently in use. arcaS.e Wator samples wero collected from tho princip: Tho gamma dose ratcs are avoregos for the inhabited k. With regard to certain minor discrcpancics between the survoy methods usby Major R. D. Crea and the writer; it was originally planned to perform the suri | jointly, and when it bccamo advisable to scparate and survey different atolls, no timc remaincd for discussion of deteils of techniques, : 5. Gamma-ray dose ratcs on Wotje and on Erikub are cach the average of MX-5 and AN/PDR-39 average rcadings which agreed reasonably well. Theo MX-5 was render inoperative when the rubber life raft was swamped by surf onthe first attcapt to launch from the beach at Erikub. Following tho Wotho survey, the PDR-39 develops¢ a temperaturo-depondent reading of 0.4 - 2 mr/hr, so that later readings in this range are of very dubious reliability. 6, The following tabulation swomarizcs the atoll survey. Water Sample: ATOLL ISLAND DATE TILE WOTJE ORMED § Mar 1600 ERIKUB EN OE i ERIKUB 5 Mar 1715 AMPLE NO S is Seil, Wis MRAHR & SAMPLING S5 3.5 mrfnr, l-bcach, 3-mid-vill.. w6 4 well plus 4 catch basin. S6 1.5 orfhr. age, l=-back village. l-mid-village, 1 on path to boach. No inhabit— ants, no water supply found.