A fifth project, sponsored by the Diamond Ordnance Fuze Laboratory, studied of nuclear radiation on electronic fuze components and materials. Electronic components were placed in special test circuits to the property to be measured. The signals were fed into a magfet recorder, which recorded the performance of the components during detonation. In addition, the telemetering points of a Corporal fuze sys- tem were monitored, and departure from normal operating level was recorded on the tape. =" Neutron dosages of: r were recorded at experimental stations. As a result, some noteworthy changes in electronic gear were observed: BR may be tentatively concluded that: 1. Almost all electronic components may suffer deleterious effects after a nuclear detonation which cannot be detected by simple measurements. 2. Many transient effects would not have been noted in reactor experi- ments. 3. 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 en- vironment. Program 8, Thermal Radiation and Effects It was the purpose of the program to (1) study the effects of megaton range atomic weapons on materiais and to evaluate a skin simulant as a substitute for animate skin in these studies; (2) obtain spectroscopic meas- urements 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 experiments. For the very high altitude event, shot Yucca, two RB-36’s were modifled to serve as instrumentation platforms. Special windows and shelves were provided for the instrumentation and special wiring was installed. The air- craft were provided with special radar equipment to track the balloon assem- bly and position themselves. The AOC-CIC aboard the USS Boxer, which also served as the balloon launching platform, was utilized for control and as a back-up positioning system. Hoth 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