confidence level and is obtained from mic mean exceeded tes, the observed standard tables, and comparing the bias was said to be significant value of C°sp with py. with a$5 percent level If the logarith- of confidence. Initial Processing of Field Samples SOIL SAMPLES blew warm air into each unit, which Soil samples, by far the largest was equipped with a fan in the vent category, were treated similarly to pipe. those samples obtained during the- in a large commercial drying oven 1972 Enewetak Survey. ~ at 150°C. The treatment consisted of drying, pulverizing, blending, screening, packaging, preliminary gamma assay. and Three Final drying was accomplished Samples were ground in a l-gal paint can using eight l-in. balls. The cover of each steel can was separate aliquots were produced from taped securely; each soil sample: was covered with a galvanized-steel can" an aluminum "tuna containing 300 to 350 ¢ and two vials containing 50 2 each. The soil-processing facility was then the entire can jacket that was held in place by two large rubber "0" rings to prevent the lids from falling off during ball carefully surveyed for possible milling. radioactive contamination. could be milled overnight to provide <Air- Filter samples and swipe samples 15 to 24 h of grinding. Packaging, weighing, and labeling taken from the floors were analyzed For 60 Co, content. 137 Cs, and There was contamination. 2394240 The Pu A maximum of 48 samples of samples were performed by hand. no detectable All work with finely divided soil was area was performed in fume hoods. considered suitable for initial sample was packaged, processing of soils. laid This monitoring out on Before each clean paper was the hood bench. Care was program continued throughout opera- taken to prevent cross-contamination tion of the facility. of samples. Drying ovens designed and built for The following is a detailed chrono- the Enewetak Survey were used for logical description of initial drying of samples at approxi- e mately 70°C. Two ovens were con- the operations: The samples were first unpackaged from the shipping container and structed of asbestos board with steel logged. shelves inside; sample was noted (e.g., amount of + eee on £e7 ee = two 300-W air heaters The appearance of each