Project 5.7 = Thermal Flux and Albedo Messurenents from Aircraft Capt. R. L. Dresser ORJECTIVE The objective of Project 5.7 participation or this dot was to obtain thermal flux and albeto information of a nuclear detonation with airborne calorimeters, radiometers, and alxteen millimeter motion picture cameras, USTSUMFNTATION Instrumentation within the purview of Project 5.7 whioh was installed in the B47 included nineteen NRDL calorimeters and two NRDL radiometers, for measuring the direct and surface reflected thermal radiation, Six calorimeters were utilized to measure thermal radiation which was back~ scattered toward the cockpit. Seven GSAP N-9 cameras were utilized-to- obtain photographic coverage of the fireball, the earth's surface, and of clouds beneath the aircraft, and also of any refleeting surface such as a cloud which could cortribute to the back-scattered radiation, Project 5,7 instrumentation on the B-52 included the twenty-one basic instruments for thermal radiation measurements, but only an additional two instruments were utilized for back-sceatter measurements, Eight OSAP cameras were installed for photocrraphiec coverage. Project 5.7 inatrurentation on the B-57 consisted of the basic twentyone instruments and six cameras, Project 5.7 instrumentation on the B-f£6é consisted of the basic twentyone instruments and twelve cameras, SNL Neither tactical bomber (B-¢6, B~57) was inatrumented for measuring back-scattered thermal radiation, The twenty-one basic thermal instruments