Daily rain showers, typical of the Marshalls in the spring, provided additional decontamination for articles stored outdoors. The release of vehicles and equipment contaminated at 0.010 R/hr or less still presented a problem when these items were removed from storage for use at Enewetak or shipped to the United States. Even these low emis- sion levels jeopardized low-level decay measurements in sensitive areas; therefore, low-level contaminated equipment was excluded from them. Further decontamination of these items would have been difficult and impractical. Scientific experiments were usually decontaminated by brushing or a water spray before transport to Parry. decontamination procedure In some cases, however, the entire (e.g., TG 7.4 aircraft) was conducted at Parry (Figure 39). Figure 40 shows a tent for changing contaminated clothing at Parry. Contaminated clothing was removed at this and similar checkpoints to avoid the spread of contamination into uncontaminated areas. TG 7.2 used three mobile laundry units to decontaminate clothing for TG 7.4. The laundry Plant on Enewetak Island employed 41 men on the day shift and 17 men on the evening shift. The contaminated wastewater drained directly into the lagoon. Radiation of personnel and material was measured with side-window-type Geiger counters. The instruments, which contained counter tubes with wall thicknesses of about 30 mg/cm’, were used with the beta shield open. When possible, the surface of the probe was held from 1 to 6 inches (2.5 to 15 cm) from the surface under observation. Aircraft Decontamination Table 13 lists all aircraft involved in CASTLE. In addition to the TG 7.4 cloud tracking and sampler aircraft, P2V-6 aircraft required decontamination, as did the amphibious aircraft used to evacuate weather station personnel from Rongerik and natives from Rongelap. 152 The RAF Canberra sampler