Upper Atmosphere Monitoring Program. Progress Report No. 6 Covering period November 1, 1958 to January 31, 1959. Report No. 1903

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Description

Programs of research into the physical parameters involved in the collection of airborne radioactive particles and the development, fabrication, and calibration of balloon-borne particle sampling equipment to implement the precise determination of stratospheric particle concentration and particle size distribution are reported. A two-stage rectangular jet impactor which collects airborne particles by impingement on a flat plate and is designed to obtain data on size distribution was fabricated. Another devices designated as a full array impactors serves as a particle collector when its specially configured collector blades are rotated at high speed. This impactor simplifies assessment of radioactive samples by concentrating … continued below

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32 pages : illustrations

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Baumstark, J;; Torgeson, L;; Stern, S;; Schekman, A; & Zeller, W May 1, 1959.

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  • Main Title: Upper Atmosphere Monitoring Program. Progress Report No. 6 Covering period November 1, 1958 to January 31, 1959. Report No. 1903
  • Series Title: AECU (Series)
  • Series Title: Atomic Energy Commission Reports
  • Added Title: Atomic Energy Commission Report AECU-4162

Description

Programs of research into the physical parameters involved in the collection of airborne radioactive particles and the development, fabrication, and calibration of balloon-borne particle sampling equipment to implement the precise determination of stratospheric particle concentration and particle size distribution are reported. A two-stage rectangular jet impactor which collects airborne particles by impingement on a flat plate and is designed to obtain data on size distribution was fabricated. Another devices designated as a full array impactors serves as a particle collector when its specially configured collector blades are rotated at high speed. This impactor simplifies assessment of radioactive samples by concentrating the collected particles in the relatively small area of the collector blades. In order to develop homogeneous aerosols less than 20 millimicrons in diameter, preliminary experimental work was done with S13 bacteriophage. This phage is reported to be on thc order of 10 millimicrons in size. The method of its preparation for aerosolization is described. A previously developed theoretical relationship for the collection efficiency of a fibrous filter in the diffusion regime was found to give results which are in satisfactory agreement with experimental data contained in the literature. Despite limited experimental data, it was possible to compare simultaneously taken samples from a ducted, shock-mounted high velocity, direct- flow sampler and an un-ducted, non-shock-mounted, low velocity Ash Can sampler. Assayed results of the former were found to be twenty five times greater on the basis of dpm/std ft/sub 3/ than the latter. Recycling of air through the Ash Can sampler is believed to be the prime cause for the observed discrepancy. An experimental method is described for determining the particle size of stratospheric radioactive debris from a double filter experiment performed at altitude. (For preceding period see AECU-3974.) (auth)

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32 pages : illustrations

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Digitized from microopaque cards (2).

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  • Report No.: AECU-4162
  • Grant Number: AT(11-1)-401
  • SuDoc Number: Y 3.At 7:22/AECU-4162
  • Accession or Local Control No: metadc1240588
  • Archival Resource Key: ark:/67531/metadc1240588

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  • May 1, 1959

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  • Nov. 5, 2023, 7:58 a.m.

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  • Oct. 24, 2024, 10:39 a.m.

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Thumbnail image of item number 1 in: 'Upper Atmosphere Monitoring Program. Progress Report No. 6 Covering period November 1, 1958 to January 31, 1959. Report No. 1903'.
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Baumstark, J;; Torgeson, L;; Stern, S;; Schekman, A; & Zeller, W. Upper Atmosphere Monitoring Program. Progress Report No. 6 Covering period November 1, 1958 to January 31, 1959. Report No. 1903, report, May 1, 1959; Minneapolis, Minnesota. (https://digital.library.unt.edu/ark:/67531/metadc1240588/: accessed December 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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