18 resultados para Atomic systems

em University of Michigan


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Mode of access: Internet.

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U.S. Atomic Energy Commission Report No. TID-3561(REV. 4).

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Because the use of filters to sample particulate matter suspended in the upper atmosphere has been investigated and has yielded rather disappointing results, an examination of other methods of upper atmospheric sampling is desirable, and this is the aim of the present report. The nature of any radioactive material, and its relation to the size and composition of the suspended particles is of particular interest.

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Shock tubes have been used successfully by a number of investigators to study the biological effects of variations in environmental pressures (1,2,3). Recently an unusually versatile laboratory pressurization source became available with the capability of consistently reproducing a wide variety of pressure-time phenomena of durations equal to and well beyond those associated with the detonation of nuclear devices (4). Thus it became possible to supplement costly full-scale field research in blast biology carried out at the Nevada Test Site (5,6) by using an economical yet realistic laboratory tool. In one exploratory study employing pressure pulses of 5 to 10 sec duration wherein the times to max overpressure and the magnitudes of the overpressures were varied, a relatively high tolerance of biological media to pressures well over 150 psi was demonstrated (7). In contrast, the present paper will describe the relatively high biological susceptibility to long duration overpressures in which the pressure rises occurred in single and double fast-rising steps.

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"November, 1975."--T.p.

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"AEC Contract AT930-1)-2137."

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"June 1964."

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"Work performed under Contract No. AT-30-2-Gen-16."

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"Contract AT(30-1)-2789."

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Previously published data was used for an empirical study of critical arrays of slab and cylindrically shaped vessels interacting through water. These vessels contained an aqueous solution of UO₂F₂ and the U²³⁵ isotopic enrichment was greater than 90%. Approximate isolation thicknesses of water for each of the above two cases is given.

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"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

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"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

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Inserted Report documentation page designates D. W. Boyer ... [et al.] as "authors."