198 RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL parts, that two engine repairmen were added to the FRST to keep these machines running. From a total of 85 air samplers shipped, an operational high of 42 was reached in December 1978.49 Although continuous attention and high-priority efforts were required, an adequate supply of Operational air samplers was always maintained, Optimal operation required one sampler located upwind of any potential dust-generating operation and one to four samplers placed immediately downwindof the area. The number downwind was determined by the size of the area of operations.4! kha Five lapel air samplers were obtained from Sandia Laboratories, Albuquerque, in December 1978 for an experimental program of representative sampling of air in the individual’s breathing zone. When the effort was terminated in May 1979, about 245 cubic meters of air had been sampled and no detectable activity had been found. The gasoline-engine-driven air samplers were quite noisy in the close confines of the soil-haul watercraft, and severe maintenance problems were experienced from the continual exposureto salt spray. For the LCUs, it was a relatively simple matter to obtain electrically operated samplers since these relatively large craft had ll0-volt AC power available. The LCM-8s were more of a challenge. These craft had only 24-volt DC electrical systems. An AC to DC converter wastried to enable useofa 110- FIGURE 4-9. ROOTS-TECUMSEH AIR SAMPLER.