ION 12682) 10 July 192 aad MEMORANDUM FOR: A. C. Graves a3 FROM: W. E. Ogle SUBJECT; RECENT CHANGES IN THE IVY PROGRAM SYMBOL: J -1293L e : * _ PROGRAM 1 - RADIOCHEMISTRY Project 1.3 - Sample Collecting A “a | s4 Dr. Harold Plank is now making arrangements for comparatively simple\back-ups on the air sampling for Mike Shot. He plans to arrange containérs of some sort which will allow for the collection of radioactive water after the shot if there is difficulty with the airplane sampling. cox This water sampling would not be by remote control. a to be on Engebi. a He also plans to- arrange for two blower-type air samplers, one to be on Bogallua, the other The details of these collectors are not yet available. PROGRAM 2 - PROGRESS OF THE NUCLEAR REACTION Projects 2,2, 2.3, and 2.4 have been gr atly changed from the techThe samequantit 8) i.e., time between the nigues originallyplanned, However, instead of the signals being tran fitted by light from the Domb to the recording station, they will now be transmitted by gamma rays. In order to transmit the signal that fergby gamma sayy , it will be necessary to replace the air between bomb a rise of the reaction gemma rays formed in the uranium ation with helium. The will be observed by e bomb. The propagation of the reaction will be observed by@anex-type experiments. Further detaile of this experiment are available in the J-Division monthly report for June. Because of the replacement of air b to measure t been added as Project 2.6, fa io a Tenex-t experiment The project director is Dr. E. H. Krause. NCELLED CLASSIFICATION CA . r rrea:bited, Copled/Doge . spot LANL,J-Diy, FOU Guricuybee PANG RC