Ses 0021620 (NTS soil) and the Tewa curve with Zuni curve (coral) indicates also that the gross fractionation decreases with yield. No comparison can be made between the coral and NTIS soil from these curves because of the large differences in yield and distances. A summary of corrected "R" values (i.e. corrected for mass chain yield from U€3> t6 the fuel actually used) is given in Table 8 for some Operation REDWING data.l2 A general increase in the "R" values with distance is shown-for all the radionuclides in the Zuni and Tewa fallout. In Shot Flathead only the radionuclides with rare gas precursors were fractionated. In Shot Navajo, there was no fractionation in the fallout (within experimental error). . " Rough correlations of the "R" values of Table 8 with distance and also those of References 19 and 20 with particle size (with aid of Eq. 14) can be made if a fractionation parameter, z, is defined as te (29) where rj is the "R" value for the jth mass number (or nuclide) and, . further, that 25+ 2,(d)e™ (30) Although the data of Table 8 are somewhat scattered with respect to a continuous change in rj or 23, they all can be adjusted, within about the same degree of error, to Eq. 30 with the same value of k, for a given shot. Substituting 1/a (inverse particle diameter) for x and using the data of Reference 20 gives an even better fit for a constent k,. If zfp is defined as the sum of all the z j of fission product mixture, then Zen =e = 2 ky * z, z4(3) kox ° e fp pok/NY (31a) (31d) o(