Well, the molecular diffusion you could, but this is so Brall - Pree CF 3 this accounts for #0 little spread in comparison with caused by the actions of the atmosphere that we coxpletely the nolecular diffusion in comparison. movement neglect i think the K value for molecular diffusion is 10 te tha minus onc, whore here welare talkinz of diffusicn constants of 108, Lo? and 10° ° LI‘ BY These units are square centineters per second? RAPP: Yes.. LI#3Y¥: Other questions? CWYNN 2 IT have another question, Dr. uiboy. For the study by talked with Frefeasor Libby and his proposal, which was made an assumption to part of our paper and used for calcula was that these small particles which ferm in the first stages of the fireball itself are incased in small water lets, That is, one of the reasons that you see the cloud itself is due to the moisture that is collected condensing to water droplet aise. He has made an estimate of the calcula fron that and given us the sise 15 to 70 xicrons which, if he correct in his assumptions, would sause the scavenzing iclency to go up fairly high in short tines ao that some of the bbys at ARDC have turned out on the indicator 75 to 90% scaveng efficiency for heavy rains. That may be ons mechanisn might answer that type of questio-. a F : Denartesrs oF x ~ We had thought abcut this problem. fhe only thought we aan Tye it was that we are talking here about the cloud that goes