2.2.2 Program 10, Yield Measurements by Fireball Hydrodynamics The J-10 Group of LASL analyzed fireball data obtained by Project 15.1 using several different methods of interpretation to obtain the yield of each device. The results of these methods are given in Table 2.1. 2.2.3 Program 11, Radiochemistry a, Objectives 1. To determine fission yield of the device. 2. To ascertain when possible what nuclear reactions take place in the device. 3. To study specific aspects of the reactions by radiochemical tracers placed within the device. 4. To determine the production of specific activities in certain of the devices arising from materials included in them by design necessity or by intent. b. Techniques 1. Samples of radioactive material from the cloud were obtained by manned aircraft equipped with especially designed sampling tanks. 2. Radiochemical analyses were made at LASL to determine the fraction of the bomb included in the sample and the numberof fission events. From these data the fission yield was determined. 3. Radiochemical analyses were made of these Samples to determine the production of various radioisotopes of interest from the bomb materials or from detector samples placed in or near the device. c. Results The results of measurement of fission yields by various methods are included in Table 2.2, 2.2.4 Program 12, External Neutron Measurements a. Objectives SN) 1. To determine the percent|: the boosted devices. 2. To determine ‘heSi pee - 39 - eau AFWUHO 37