sae 2-26 mine the configuration of the active material during the reaction period. 2.2.2 PROGRAH 10 FIREB.LL PHYSICS Objectives: 1. To determine the yield of a nutlear detonation by otscrvation of the various parameters associated with fireball hydrodynamics, 2. To measure the time interval between the primary and seconderreactions in two stage devices by optical means, | 7 To a the —_ taking place in the rarified air —_ Techniques: vy £n 1. Several methods of calculation were used to derive the yleld of 2. Optical narrow puss filters were used with photomultipliers, and the device from fireball photos, oscilloscope to record 7anma induced light from the air ahout two stage devices. 3. Techniaues were used which alloted observations of narrow bands of the optical spectrum by means of photomultipliers and oscilloscopes with high time resolution. Results: 1. A list of yields obtained by procram 10 is given in table 2,1. 2. Some information about relative intensity of ecrly gamma induced light is given in table 2.2, 36 usd * cO/D0E LAL RG mee mer, Lene se Pace S*/ Ye /