0021620 see of h, use of the empirical functions from reference 5 in Eqs. 15 and 16 gives, for constant V,,, W(t) wo:38 2 , W x q (19») x = 12 to > 104 (19a) = 1 to 12 kT (20a) , We 12 to > 104 (200) r f ( ~ fo we w » §o ct — HH ~~ 1 to 12 kT G, x U - k in which Ks» K6> ko, and kp are constants. This rather simple treatment of how the value of M.(t) may depend on weapon yield, downwind distance, wind speed, particle fall rates, and on the mode of fallout particle formation indicates at least the scope of the information required in the development of a reliable scaling function from observed data. 3.5 MEASUREMENT OF CONTOUR RATIOS AND PARAMETERS EFFECTING THE OBSERVED VALUES OF THE CONTOUR RATIOS DOE/NV There are two methods for determining the mass contour ratio; each requires a radiation measurement and a fallout sample. The most direct method is to collect samples and weigh them (with appropriate analyses for correction to a scalable mass). The second method is to obtain sufficient pure fallout to determine the specific activity of the fall- out and to determine, by soil sampling in the fallout area, the activity per unit area. The fraction of device contour ratio can be determined from the same samples of fallout and radiation measurements; radiochemical analyses of the samples are required. RESTRI V/ Ps