=~ eee ak. » - ~ A — EeAe AVET VI. < RECOMMENDATIONS : A. Every attempt should be made to determine the particle concentration in the atomic cloud produced by the Mike Shot of IVY in order to determine the validity of the calculations contained in Table III of this preliminary report. Program 5.4b of IVY may shed some light in this matter, B. Experts in the field of atmospheric radiation should be asked to check Humphreys! calculations concerning the number of particles of 2 micron diameter required to reduce solar radiation by 10 to 20%. lated that approximately 2 X 1024 particles are required. Humphreys calcu- In the present ' gtudy, $t has been assumed that the correct figure is between 2 X 10*°* to 2X 10° particles. It is recommended that this range of values be checked, C. Experiments should be made with scaled values of TNT. Such TNT explosions should be made on different types of soil and the particle size distribution, particle concentration and total number of particles in the cloud from TNT explosions should be determined, Such data should then be scaled to atomic explosions to determine the accuracy of calculations contained in Tables III and IV of this preliminary report. D. In the event that it is possible an attempt should be made to evaluate the temperature upon the countries located in compared to those countries in the middle to reduce the surface temperature, effect of such a decrease in the more northerly latitudes as latitudes or in the tropics. E. Different types of soil should be sent to V. Schaeffer or other experts in the field of nucleating agents to determine the relative nucleating properties of the dust that will be ejected aloft by superweapons. This recommendation is based on Dr. Wexler's statements concerning the nucleating properties of volcanic ash (see references 2 and 2a), F, An attempt should be made to determine the circulation pattern in the level of from 70,000 ft. to 100,000 ft. m.s.1. during November in the latitude of Eniwetok. Once this circulation pattern is established, action should be taken to determine whether there are any visible evidences of dust aloft from the superweapon that will be exploded at IVY, provided the superweapon at IVY is to be detonated either on the surface or at a height not over 50 ft. from the ground, | 1 Inel. Distribution List C2-22190