Number of aircraft that obtained usable cloud samples, CASTLE. Aircraft Type BRAVO ROMEO KOON UNION YANKEE NECTAR B-36 2 2 2 1 l 2 B-29 1 1 1 1 1 1 17 F-84 wz 2 7 2 1 TOTAL 15 15 9 9 10 Source: Reference 29. l. Aircraft were parked in an isolated area and allowed a cooling off (decay) period of 20 hours. 2. Stands were positioned and cowling removed. A1:5 mixture of gunk-kerosene was applied over the aircraft exterior surface and engines. This was washed off using a warm water and detergent mixture followed by a plain warm water wash. After 30 minutes for the surfaces to drain, radiation measurements were made. 3. Radiation measurements were made using AN/PDR-39 4. The procedure in instruments. (1) to (3) above was repeated. Reportedly, after two such washings the contamination level could not be noticeably reduced further. Nevertheless, many aircraft were subjected to more than two washings. For the first two shots, BRAVO and ROMEO, the F-84G samplers were first washed with a citric acid solution. This type of decontamination was sug- gested by a LASL scientist as a means of collecting potentially valuable radioanalysis data on certain heavy radionuclides, but the procedure was scrapped after ROMEO. Decontamination of the F-84Gs required up to 30 gallons (114 liters) of gunk, 150 gallons gallons (568 liters) of kerosene, 100 (379 liters) of soapy water, and 300 gallons (1,140 liters) of rinse water for each aircraft, depending upon the degree of contamination. Larger aircraft required commensurately more materials. izes the decontamination materials used. 160 Table 16 summar- d sth: lal eee, 5Picken Table 15.