£8, me 8 ek £3 OM 8 wt —— addition, numerous pieces of small equipment were cleaned up for the various projects and for H&N. Normal procedure called for all heavy equipment returning from shot islands to be monitored on removal from boats at the boat landing and directed to the decontamination station if necessary. Versene and citric acid were the common decontaminating agents employed, and a steam generator was used to provide hot solutions for the necessary washing. When equipment was not needed immediately, the vehicles were held in a ‘hot" parking lot for varying lengths of time before decontamination tn order to reduce contamination levels by radioactive decay of the contaminants. 2.1.3—The Plotting and Briefing Section was responsible for the conduct of all radiological surveys on the atoll, the majority of which were made by helicopter. Normal operations included a pre-entry survey with CTG 7.1 at H+1 to H+3 hr, a detailed survey of the entire atoll at H+4 to H+é8 hr, and detailed surveys on the mornings of D+1 and D+2 days. Additional surveys were made as required. The basic instrument used in the aerial surveys was a special ionization chamber built by Jordan Electronics, Inc., to the desired specifications. Some AN/PDR-39 survey meters converted to read 500 r/hr were also used. When necessary, data were radioed back to the ~Rad-Safe Center from the survey helicopter, Plotting and briefing stations were maintained in the Rad-Safe Center and the J-3 office. Ground surveys of islands in the atoll were conducted when required. ve 2.1.4—Monitors for recovery parties were provided by TU-7 when necessary. The demand was quite small. Normally, no more than two or three were furnished after any one shot. In general, projects provided their own monitors as members of the recovery parties. Monitors were respon- sible to party leaders, who were expected to accept a monitor's advice and plan their operations accordingly. 2.1.5—Laboratory facilities for radiochemistry work at Eniwetok Atoll were obtained from the Army Signal Corps. One radiochemistry trailer, AN/MD@Q-1, was parked near the Rad-Safe Building and used for all sample preparation and counting. The work load of the Laboratory Section at Eniwetok was quite small. mately 100 samples of lagoon water were devices were fired. In addition, several tritium urine ang contamination after the fem periormed., tain amount of alpha-counting was necessary. Because of alpha ¥\shots, a cer- Rain-water samples were col- lected and counted periodically for grosa beta-gamma activity or total alpha activity. Chemical analysis was not required. 2.2 Shots and Survey Results During the entire Eniwetok operational phase, the contamination from ~- 12 -