i= Memo for Graves fm Ogle, 7-10-52, subj: Pp. 2 Recent Changes in the Ivy Program PROGRAM 3 - SCIENTIFIC PHOTOGRAPHY Project 3.3 - Hot-spot Observations Experimental work at Operation Snapper has suggested certain minor changes in the technique to be usedon this experiment. In particu- lar, the pipes will be lengthened from 20 to 35 ft, they will be filled with helium at the time of the shot, and at least two collimating baffles will be placed between the mirror system and the cameras on Bogallua. Recent listings of the programs and projects of Ivy have neglected to indicate that there are project co-directors of Project 3.3: Mr. Berlyn Brixner and Dr. Gaelen L. Feit. PROGRAM 4 - NEUTRON MEASUREMENTS Project 4.3 - Neutron Spectrum - Nuclear Emlsions Because of the addition of Project 2.6, this project has been dropped from the program, PROGRAM 5 - GAMMA-RAY MEASUREMENTS Project 5.3 - Fall-out Gamma Intensity Plans are now being made to turn this project over to Livermore, a group at the Radiation Laboratory of the University of California at Berkeley, It is proposed that they finish designing and building the equipment necessary for these measurements‘and carry out the measurements in the field, Project 5.4a - Fall-out Distribution and Particle Size Project 5.4b - Close-in Particulate Cloud and Fall-out Studies Project 5.4a has had the number of land sampling stations reduced from 8 to 5, and Project 5.4b has had the number of land stations requiring Holmes and Narver construction reduced from 33 to 12. However, H+N is being requested to provide labor to assist in temporary-type construction to house as many of the additional stations as is determined to be possible after the project personnel arrive at the site. These reductions in stations were made necessary because the present H+N workload precludes their construction in time to meet the M - 7 deadline. The number and placement of DAN buoys for Project 5.4a is still being discussed between the project officer and TG 132.3. Copje WD, -2. bse enerT OF ty |