0021620 | aa It may be noted that z is defined as the ratio of the fraction of the nuclide contained in the particles to that not contained in the particle (i.e. lost from the particle) assuming r, for the reference nuclide (usually Mo99 ) is unity. With this definition, Eq. 31 has no real significance except for the cases where all rj are either 1 or O or where 2% is taken to be proportional to the average value of z,(j) for the mixture. With the latter of the two views of 22, the data of Table 1 and Fig. 1 were used to obtain values of k, forShots Zuni, Tewa, and Coulomb C, and z2 for Shots Shasta, Tewa and Zand, for applicstion at H+lhr. The respective k, values are 8.1 x 10°, 9.6 x 10, and 4.5 x 1079; the respective 22 values are 0.41, 0.65, anf 0.73. Since Shot Tewa was detonated in 2>°feet of water, the values of for only the Zuni and Coulomb C Shots were used for obtaining constants for an assumed dependence of k, on weapon yield and the z2, values for Shasta (Diablo) and Zuni were used for a scaling function’for Zo The two assumed empirical functions are k, = 4.1 x 1079 wor® (32) and o _ Ze, = 0.32 wo 086 (33) in which the respective values apply only to determining ep at H +1 br where oe Kk +z tp By Eq. 34 rp, (34) por/NW can approach unity as the distance increases. Equation 32 indicates that Tey approaches unity at shorter distances as the yield decreases, and Eq. 33 indicates that the fractionation decreases as the yield increases. These trends in fractionation correspond to the observed data. The constants are adjusted to rp, values with respect to and assume no difference between coral and NTS soil. The values of zp, devices are given in and k, for the fallout from some of the test Table 9. The fallout from the surface water (barge) shots of yield 5 MT and larger is assumed to be unfractionated.