TT SECREA RAYWIND methodology were eliminated also. UNCL SSTFIED {=1175-AEC -30-53 This would have given [the height of rise of the cloud and the direction of the winds at various matters being extremely important for the correlation of eny loc that did occur with meteorological conditions and ellowing the p for future tests of local fall-out. The conference therefore confludes that it is of the utmost importance that local sampling all around, pafticularly in the down-wind direction, be done at the CASTLE tests. It is also important that the measurements on height of rise of the cloud and velocityfof wind and function of height using the RAYWIND methodology be used. Ac ation urging this was sent by the conference to the Chairman of the Atomic Eneagy Commission (Appendix E to this Report). B. World-wide Sampling in Connection with CASTLE. It seems clear that the dissemination of radioactivity o world can be measured in a numberof ways, but since the time is secrecy conditions or restrictions are such to prevent any use of oF the real purpose of the program, some conferees agreed that t. SUNSHINE PROJECT should proceed to institute a world-wide rain-s for next March, April, May, Jume and July using the project now the University, on the “Occurrence of Tritium in Nature” as a cover existence at operation. At the present time water samples are being acquired from all over|the world to allow for measurement of the tritium content in an effort to deterprine the distribution of cosmic-ray-produced tritium. These samples can bejperfectly well used for strontium assay without in any way changing them for[the tritium ansay. The procedure is simply to add soluble starch and salt to fhe sample, 1045312 . aeeper—E- ae UNCLAPSIFIED LANL