They measured the SANDSTONE cleuds over Washington, using Geiger scunters and balloons. EISERSUDs What is the percentage of recovery of these balloons? KELLOGG: They had a project called 3OBY DICK in the Air Foros, and the original IBY DICK gear were rather expensive and they wanted to get then back, so they put $25.00 recovery prise on it. Cut of all the ones which they know came dewn in this country, they recovered every ons. Fvery one was sent back, either by their sending out a search party or just being eeiled back by some farser. I think this consisted of abeut 20 boxes. Now they know gone of thea went down in the cesan, but the ones they know landed in the country—they got every one back. KRASISH: What was the air sampling achieved? ow was the collection made up? KELLOGG: That's a good question, and we talked abent that yesterday. The question was, "Sow does ene go about air sampling frou a ballcen?* Some of the suggestions were-—eince we were talking then about the exell particles in the air being the current problem—what is the real distribution of particle sises in the small range? It was suggested that one could use something Liko an slectrostetic precipitater, as was developed by ICL for aireraft wee. Or, in this case, one hase the tine to sit up thare and use a therme-diffusion separater~that one sould even imagine using this to collect these very suall sizes.. Pe DOE ARCHIVES (> ~~, y> WYCKOFFss