mf nSsaots of We pages This docu ---. no. ££ of 22£Coptes, Series > unned <. © OPERATION HARDTACK <. Project No: ©O Agency: WY) Og Lis 2.8b WRDL & LASL Shot Participation: : (1 over land and 1 over water) > CA Ld foun Li ened Lid Aa 9 411017 Title: Aircraft Fallout Sampling Project Officer: Dr. R. R. Soule . U.S. Naval Radiological Defense Lab San Francisco, California ATTN: Code 3-934 Phone: MIssion 8-6900 Objective: | S s¥ WY To determine the relative contribution of certain isotopes to both local and world-wide fallout. To use this information, if possible, to determine the fraction of total bomb debris deposited in the local area. WN‘oy Description peserdpts WN and Experimental Procedures: 1. To date, fallout collection methods have not allowed a direct 40 ti9 YRS comparison between fallout samples and close-in samples, such as have been Zz oO < a Ou zo 06 r ate re a OE ie 35 5 roatinely obtained by sampling aircraft. This project is designed to provide correlation between high altitude sampling and low altitude sampling with : comparable techniques. 2. Three B-57D at the highest altitude attainable and four to six B-57B at appropriate high altitudes will collect both particulate and gaseous samples as soon after detonation as is practicable and at several tires thereafter. Final collection will be made approximately 6 hours after detonation. At least one additional aircraft will be used for control purposes, and more sampling aircraft will be used if they are available. 3. Two or three B-50 aircraft will collect several particulate samples at an altitude of approximately 1000 feet along predicted “height lines", to allow fractionation between particle size for selected isotopes to be determined. This will provide data on the relative céepletion of nonrefractory isctopes in fallout. -Height lines will be chosen to aliow a direct comparison between results of the high altitude and low altitude collections. In addition, one higher height line will be used; one which is limited only by B-50 range capability and!smallest particle size sought. US DOE ARCHIVES RG 326 US ATO*NC EXERGY COMMISSION Calectian LASI- ES fo arn Box Polder ft tae f j[- 0fro Frern ~~ + /{~*