subsequent to a detonation, the fallout material can be considered as peing composed of one or more of the following three componente: (1) corel, (2) sea water, and (3) device products (DP), By proper choice of elements, the chemical changes of the constituent compounds of the packground components need not be considered. The radioactive device products are treated in other sections. TABLE 3.12 - Summary of Results for State of Iodine Shot 1 2 Station Time After Percentage of Shot Todine in Solid Phase Percentage of Apparent Total Gamma Oxidation Count State 250.05,250.06, + 6 to 7 50=80 ca 5 “1 2-46 + 2.5 to ca 0 oa 6 “1 5 -1 0.7 “1 251.02 days + 3.5 days 3 Coca Head +3 days 93 4 |airplene wipe +16 hr ca 0 3401 Physical Treatment of 88 The activity of each sample was first measured with a laboratory survey meter, The liquid fraction, *f any, was then separated from the solid phase by filtration through a weighed sintered glass frit. The activity of each phase was again measured, The volume and pl of each liquid frection was then measured and the weight of solid was determined. In generel, the samples treeted were portions from the fallout collectors aliquoted at the site laboratory. 3.Ae2 Chemi Treatment of es The liquid samples were processed without chemical pre-treatment whenever possible. The solid fractions were dissolved in nitric acid which usually diesolved most of the material. Remaining organic residues. were oxidized by the wet ashing method using perchloric acid as the oxidising agent. Two such perchloric acid treatments usually gave 4 clear colorless solution. Chemical analysis of the solid fractions was done whenever the total solids were greater than 5 mg. In general, the chemical treatments of the samples were restricted to a minimum of reagents to prevent as far as possible the addition of elements eas impurities which were being determined. The analytical methods for the various elements are summarized in Tables 3,13 and 3.14. The Beckman flame photometer was specially designed to permit analysis of radioactive samples without hasard to the analysts. The elements Cl, Na, K, lig, Ca, and Sr were designated as 59