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Träfflista för sökning "WAKA:ref srt2:(1965-1979)"

Sökning: WAKA:ref > (1965-1979)

  • Resultat 41-50 av 3258
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41.
  • Akselsson, Roland, et al. (författare)
  • Elemental Abundance Variation with Particle Size in Aerosols from Welding Operations
  • 1974
  • Ingår i: Proceedings of the Second International Conference on Nuclear Methods in Environmental Research. ; , s. 395-401
  • Konferensbidrag (refereegranskat)abstract
    • The effect of airborne particulate matter on human health is today of considerable research interest. Essential parameters include elemental composition sampling with low pressure cascade impactors and analysis by particle induced x-ray emission spectroscopy (PIXE). It is shown that the aerosol generated by arc welding operations is several orders of magnitude denser than aerosols in ambient air. Most of the mass is found on particles between 0.1 and 1µm diameter, but the size distribution differs from one welding technique to another. The relative composition of the aerosol is found to differ significantly from that of both the welding piece and the electrode indicating the presence of fractionation of the type indicated in this work in designing electrodes and welding pieces to minimize the health hazards associated with the welding.
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42.
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43.
  • Akselsson, Roland, et al. (författare)
  • Mass Calibration in PIXE Analysis
  • 1977
  • Ingår i: X-Ray Fluorescence Analysis of Environmental Samples. - 0250401347 ; , s. 175-180
  • Bokkapitel (refereegranskat)
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44.
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45.
  • Akselsson, Roland, et al. (författare)
  • Particle Size Distribution and Human Respiratory Deposition of Trace Metals in Indoor Work Environments
  • 1976
  • Ingår i: Annals of Occupational Hygiene. - : Oxford University Press (OUP). - 1475-3162. ; 19:3-4, s. 225-238
  • Tidskriftsartikel (refereegranskat)abstract
    • Respiratory response to inhalation of fine particles has been investigated for the aerosol generated by welding. Particles were sampled using a pair of 5-stage cascade impactors operating at 1 l./min flow rate. The subject exhaled into one impactor through an air ballast arrangement, and the other impactor simultaneously sampled the surrounding air. Particle size fractions were analyzed for principal elemental constituents from sulphur to lead using proton induced X-ray emission, PIXE. The results indicated a complex respiratory response, including both increase in particle size due to exposure to high humidity in the respiratory tract and deposition of particles during inhalation. The response was found to be different for the element group Mn, Cr, Fe, Ni compared to the group K, Ca, Ti by observing the associations among the elements as a function of particle size in the inhaled and exhaled aerosol. However, for respiratory deposition efficiency alone in all runs averaged together, no systematic differences between the different elements are demonstrated at the 99 % confidence level.
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46.
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47.
  • Akselsson, Roland, et al. (författare)
  • PIXE Analysis Research in Lund
  • 1979
  • Ingår i: IEEE Transactions on Nuclear Science. - 0018-9499. ; NS-26:1, s. 1358-1362
  • Tidskriftsartikel (refereegranskat)abstract
    • Protons or a-particles from a 3 MV tandem Pelletron are used to induce characteristic x-rays, which are detected by a Si(Li)-detector. To optimize the quality and speed of data taking we use an absorber with a hole, pile-up rejection and on-demand beam. Forty samples may be entered simultaneously into the vacuum, and their positioning is operated by pushbuttons. The system is prepared for minicomputer steering. PIXE is combined with analysis of backscattered particles and in some cases γ-ray detection from a 19F(p,αγ) 160-reaction. At different stages of development we have a bent-chrystal spectrometer, microbeam and facilities to extract the beam from vacuum. In the introduction of PIXE to applied fields, it is important, that physicists take part in identifying, planning and performing suitable projects e.g. experiments where rapid multielemental analysis of many samples is crucial. In Lund we investigate the elemental composition of size-fractionated airborne particles from work environments and ambient air. The objectives are then to learn about sources, transport and deposition of particles and to contribute to the understanding of relations between exposure and health effects. We are also developing procedures for trace elemental analysis of water. Detection limits in the range of 0.1 ppb have been demonstrated. In other projects in progress biological and mineralogical samples are analysed.
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  • Resultat 41-50 av 3258
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Nordén, Bengt, 1945 (84)
Friberg, S (63)
Smedby, B (58)
von Sydow, E (58)
Akselsson, Roland (56)
Tove, PA (52)
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