PPSSeNtT STsTUS OF THE LASL PORTION of the IVY EXPERIMENTAL PROGRAM The following listing is an outline of the Ivy experimental program as it appears to date. MIKS SHOT PROGFAM 1 pisegee RADIOCHEMISTFY - LASL-J-11 (R. Spence) 1.1 Babi Yield Meesurements - LASL-J-11 (Fk. Syence) The determinction of the radiochemical yield of the + 8 still not in a completely satisfactory condition. However, it does eppeer thet on2 will be able to measure the energy release to ‘ten or fifteen per cent accuracy by determining (a) the total fission. yield by normal radiochenical meens, and (b) the total number of neutrons by observing the centures in the components of the bomb and in the nitro- gen of the cir by meane of a gas sampling program conducted by AFOAT-1. If one knowe the total nunber of fissions, knows M for the fissionable material end the spectrum used, and the total number of neutrons, one can then deternine the tote] number of neutrons arising from the thermonuclear burning. Thut number will then yield the energy release of the thermo- nuclear portion of the weapon. give the total energy release, The eum of this and the Pisaion yield will The major uncertainties in yield meesurementsa are; (ea) The question of whether adecuate samples can be (>) The question of fractionetion, and (c) The possibility of deternining the totel number collected, of neutrons. All these uncertaincies look quite hopeful at thie time. 1.¢ Internal Nucleer Detector Measurements - LASL-J-11 (G. Cowan) Various diamostic quantities will be meesured by the use of internul naclear detectors. These are as follows. Copled/DOE LANL, J-Div. . toe