pao e So C ee — C. for the three different charges are the same where dq W 173, and d«= depth of burial of charge in feet, W = weight of TNT in lbs, If explosion cloud density is some function of the amount of high explosive used, then it may be that cloud density is also a function of the equivalent energy yield of atomic or thermonuclear weapons, Of course there is no method of determining the magnitude of such a function except to say that probably cloud density increases with energy yield of the bomb by some factor, In this report it will be assumed that the cloud density for high yield atomic or thermonuclear bombs in the order of 10 megatons of energy yield, exploded at scaled depths underground would be approximately forty times the cloud density for 1,0 scale TNT explosion mentioned above, and the cloud density for surface explosions would be approximately thirty times the cloud density of the aboveementioned TINT explosion. It will be assumed that the clouds from JANGLEjunderground and JANGLE-surface shots have the same cloud density as that for the 1.0 scale TNT shot mentioned above. Under this assumption the stabilized cloud from 1,2 KT JANGLE- underground shot would weigh approximately 4 x 10° lbs., and the JANGLE}surface cloud would weigh approximately 3 x 109 lbs. This means that ~ for a 10 megeton weapon exploded at_scaled depth underground, the cloud would weigh approximately 1.6 x 10/1 lbs. and for a surface burst the total cloud weight would be approximately 9 x 1040 lbs. It will be further assumed that the numerical median particle diameter in the cloud is 0.6 micron, IV. REDUCTION OF SOLAR RADIATION BY THE LAYSR OF DUST ALOFT In the Preliminary Report, Rayleigh's Equetions for diffuse reflection and random scatter were used. These equations will be mentioned here again so that a ready comparison could be made with the more rigorous treatment of the subject by Mie, Also a computational error was made by Humphreys (1), and this will also be discussed below, A. Rayleigh's Equations 1. Equation for Random Scatter If dust particles are emaller than the wave length of visible light then according to Humphreys' text the following equation applies: -hy Ey =F eC where h® = 24 17 trWmexrzeeaenenwneananw aa o Equation 1 3 2 K' - K Pear Ye a = + = -Equation Equation" 2 K' = dielectric constant dust particles K = cielectric constant of medium V = volume of each particle _ 5008629 3 62-38529