| UNCLASSIFIED 7 7: 4 ~ me e ~ cad danieapaensietidelntant _ - inasjutiantainrts ’ ~e z “ . msntimenentaey, . ab aaaitaian sania Coated with fission preducts. —_— na ot . . _ eubtin aie “ ~ - . : + et a iiaiitimmsteiatentniieshnaas Lf it is presumed that the ratio of at, deat teal |e inactive soll debris to active sand in the fall-out area is 100 tol, then 100,000 to 500,000 tons of sand and soil debris were sucked up by each U/K tower shot, If this view is correct then certainly the pre- sence of 10 to 50 tons of tower material will not have a profound effect on fall-eut from tower shots, The surprising thing is that even when such large quantities of soil is sucked up into the cloud in many instances no crater is formed at greund zero. This means that only a few inches of soil is lifted up from the area of ground zero. Actually one inch of soil froman area of approximately two square miles would account for the total mass of soil debris sucked up in the atomic cloud. It may be possible to reduce the fall-out from low scaled height detonations by stabilizing the soil in the target area. Hovwever, it may be necessary to stabilize permanently one to five square miles of the targst area in order to prevent a significant amount of soil from being mixed up with the stem and mushroom of the atomic cloud. It is recommended that within a circular area of approximately one mile radius the target area be firmly stabilized by cement or other means of permanent stabilizatien. It is believed that if a 10 ET bomb is detonated from a 300 /% tower over such a large stabilized area, the amount of soil sucked up into the cloud would be reduced uaterially, thus reducing subsequent fall-out significantly. However, if it is impractical to permanently stabilize such a large area, then it is suggested that even if a circular area with a radius of 500 ft is permanently stabilized by cement or other permanent methods, there may still be considerable reduction in UNCLASSIFIED olla C3