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Operation Hardtack. Project 2.8. Fallout Measurements by Aircraft and Rocket Sampling,
NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA
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The general objective of this project was to estimate, from analytical data on cloud samples, the relative distribution of certain radionuclides between the local and worldwide fallout formed by megaton-range detonations on land and water surfaces, with particular emphasis on the distribution of Sr90 and Cs137 between local and worldwide fallout. Specific objectives were to 1 obtain airborne particle and gas samples by rocket and aircraft sampling techniques 2 determine the distribution of radionuclides between two groups of particles that differed from one another in their falling rates in air and that could be considered representative of local and worldwide fallout 3 attempt to determine an early time distribution of radionuclides and particles between the upper and lower halves of the cloud and radially outward from the cloud axis and 4 estimate the extent of separation of fallout from gaseous fission products by fission determinations on gas and particle samples collected coincidentally near the top of the cloud at various times following the shots.
APPROVED FOR PUBLIC RELEASE