A fifth project, sponsored by the Diamond Ordnance Fuze Laboratory, atudied the effects of nuclear radiation on electronic fuze components and materials. Electronic components were placed in special test circuits to emphasize the property to be measured. The signals were fed into a mag- netic-tape recorder, which recorded the performance of the components during the detonation. In addition, the telemetering points of a Corporal fuze system were monitored, and departure from normal operating level was recorded on the tape. Neutron dosages of r were recorded at experimental stationa. changes in electronic gear were observed: As a result, some noteworthy It may be tentatively concluded tat: 1. Almost all electronic components may suffer deleterious effects after a nuclear detonation which cannot be detected by simple measurements. 2. ments. Many transient effects would not have been noted in reactor experi- 8. Transient susceptibility was directly dependent on the degree of exposure. 4. Data from a number of diodes shows that they may be reliably employed to discharge a firing capacitor at the time of a nuclear detonation. 5. A Corporal fuze system would be highly suspect in a nuclear environment. Program 8, Thermal Radiation and Effects It waa the purpose of the program to (1) study the effects of megaton Tange atomic weapons on materiala and to evaluate a skin simulant as a substitute for animate skin in these studies; (2) obtain spectroscopic measurements of thermal irradiance as a function of time on a high altitude burst; (3) measure the fireball size of a high altitude burst as a function of time by photographic means; (4) obtain a photographic record of the early time spectra of a high altitude burst with high time and spectral resolution; (5) make measurements of the size, persistence, and spectral irradiance of the fireball in the infra-red from a high altitude burst; and (6) study material ablation from specimens inside the fireball, and test the neutron vulnerability of various materials to be used in the Teak and Orange experimenta. For the very high altitude event, shot Yucca, two RB-36’s were modi- fied to serve as instrumentation platforms. Special windows and shelvea were provided for the instrumentation and special wiring was installed. The aircraft were provided with special radar equipment to track the balloon asaembly and position themselves. The AOC-CIC aboard the USS Boxer, which al- so served as the balloon launching platform, was utilized for control and as a back-up positioning system. Both aircraft were well positioned so that all instruments had the burst in their fields of view. Excellent records were obtained by all projects whose instrumentation was aboard. In addition to its participation on shot Yucca, Project 8.5 also made 34