RAPPs { continued) availability of meteorological data than by any actual c sideration of the cloud. This cylinder of cloud was th assuzed to be torn by shear, expand at some slow rate an 100% of all the materials that cam in contact with a ra area was considered to be deposited on the ground iase tely. Thisstudy was the only one to ay knowledge in ¥ many boabs were considered, Colonel] Eolszan was trying estimate the hazards froa a canpaign of bombs in a ssall area. There are several things with due apology to Colonel Holzman, that are wrong with this. One, the cylinder ef atomic debris did not extend uniformly froa 20,000 feet down to the ground. it is generally higher than this go when the RAND stody was made, I can call this the ¥ar I ¥odel for scavenging of rain, we took a cylinder and expanded it assuming that the zaterial was homogeneously distributed through this cylinder. #e considered the observed height of the cloud, expanded it horizontally vertically and assumed that all the material below the -15° isotherm was brought down to the ground in the fora rain, Se didn’t take into account the shear of the wind, so that was one thing that was missing. Then the people Froa AIS&P worked on the problem and they said well it is any to consider all the material brought dom as soon as it hits the rain and they allowed for a finite tine of scavenging Department of Fxorny Histerinv > 0 pre i 9