gr 2-29 2.203 PROGRAI! 11 RADIOCHELISTRY Objectives: 1. To determine the fission yicld of the device. 2. To ascertain when possible what nuclear reactions teks place 3. To study specific aspects of the reactions by radiochemical in the device. tracers placed within the device. 4. To determine the production of specific activities in certain areas of the devices arising from materials included in thom by design necessity or by intent. Techniques: 1. Samples of radiocctive material from the cloud were obtained by manned aircreft equipped with especially desizmed sampling tanks. 2. Radiochemical enalyses were made zt LASL todetermine the frace tion of the bomb included in the sample and the number of fission events. From these dnta the fission yield wes dctermined, 3. Radiochemical analyses were made of these samples to determine the production of verious radioisotopes of interest from the bomb materials or from detector samples pleced in or ncear the device. Results: 1. The results of measurements of fission yields by various methods are included in table 2.1, 2, An investigation of water semples taken from the lagoon shortly after ‘ialnut shot showed merked fractionation, indicating thet such samples were not an adequete replacement for aircraft sampling. 2.2.4 PROGRAL 12 EXTORNAL NEUTRON iZASURASNTS - Objectives: t 1. To determine the configuration of the active mterical of cere tain devices curing the nuclear reactions. Techniques: 1. A neutron collimating "pinhole" is placed between the device and detector. A pinhole camera image of the device is formed on the detector, which is a sandwich of various materials to be acti~ vated by the neutrons. The sample may be cut into segments and counted on a scintillation counter or placed against a photographic film to produce an autoradiographic image. coPleD/DOE LANL RC Cop;r- LenRo“ pa P.GE wel!