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Träfflista för sökning "WFRF:(Bohgard Mats) srt2:(1995-1999)"

Sökning: WFRF:(Bohgard Mats) > (1995-1999)

  • Resultat 1-10 av 15
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1.
  • Bohgard, Mats, et al. (författare)
  • A Novel Three-Stage Radon Progeny Sampler
  • 1997
  • Ingår i: Proceedings of the Nordic Society for Aerosol Research Symposium 1997.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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2.
  • Bohgard, Mats, et al. (författare)
  • Air Pollutants
  • 1997
  • Ingår i: The Workplace. - 8291833001 ; 1, s. 433-457
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • Abstract in UndeterminedPollutants in the air can be in gaseous and particle (solid and liquid) phases. Interactions between these phases occur. The components are emitted to the air by different source mechanisms such as evaporation, disintegration of bulk material and chemical reactions. The significance of different transport mechanisms is, for airborne particles, dependent on the aerodynamic properties. Water solubility (for gases) and the aerodynamic properties (for particles) determine the site of deposition in the human airways. In work environments species with different physical, chemical and biological features can be abundant. A variety of methods are used to identify and quantify the pollutants. Remedial actions against health hazards include the substitution of materials and processes; preventing the airborne constituents reaching the environment (enclosures, hoods); local ventilation; general ventilation and respiratory protection.
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  • Gudmundsson, Anders, et al. (författare)
  • Characteristics of Mult-Nozzle Impactors with 50 µm Laser-Drilled Nozzles
  • 1995
  • Ingår i: Journal of Aerosol Science. - : Elsevier BV. - 0021-8502. ; 26:6, s. 915-931
  • Tidskriftsartikel (refereegranskat)abstract
    • The objective of this study was to provide data for the design of multi-nozzle impactors giving size-fractionated samples for X-ray emission analysis and for size-distribution determinations of the α-particle activity from aerosol-particle-attached radon progenies. Different multi-nozzle impactors with laser-drilled 50–60 μm diameter nozzles designed for a cut-off diameter of about 0.05 μm were experimentally characterised. The nozzles were placed in a spiral pattern within a circle of 8.0 mm diameter. The nozzle-plate porosities were 0.013 and 0.050 (porosity = total cross-sectional area of nozzles divided by nozzle-plate area). The results show that laser-drilled nozzles can be used for multi-nozzle impactors and that the maximum nozzle-plate porosity is limited by the cross flow. The collection characteristics of the multi-nozzle impactors studied here were found to be more dependent on the Reynolds number and the S/W ratio [the ratio of the distance (S) between nozzle plate and impaction plate to the nozzle diameter (W)], than what has been shown for single-nozzle impactors. The S/W ratio and the Reynolds number must be considered if high size resolution is to be achieved.
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6.
  • Gudmundsson, Anders, et al. (författare)
  • Deposition of Airborne Particles onto the Human Eye - Wind Tunnel Studies of the Deposition Velocity onto the Eyes of a Mannequin
  • 1997
  • Ingår i: Journal of Aerosol Science. - 0021-8502. ; 28:6, s. 1085-1100
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract In the field of occupational hygiene much consideration is devoted to the uptake through the human airways, but there are also reports of irritations, complaints and hazards or potential hazards due to particle deposition onto the eyes. There is a need for data regarding the dependence of the deposition rate on particle size and environmental parameters in order to formulate sampling criteria and to find dose-response relations. The deposition of airborne particles onto the human eye was studied by making use of a dummy, the eyes of which were covered with pieces of transparent sticky foil. The dummy was exposed to airborne particles in a wind tunnel. The airborne particle concentration was simultaneously measured using an Aerodynamic Particle Sizer (APS, TSI Inc., U.S.A.). The deposited particles were counted using an optical microscope equipped with an image analyser. For the particle sizes (2–30 μm), wind velocities (0.5 and 1.0 m s−1), wind directions (0, 90 and 180°) and turbulence intensities (1.3 and 19%) employed in this study, deposition velocities onto the eyes were determined to be in the range of 0.001–1 cm s−1.
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  • Pagels, Joakim, et al. (författare)
  • Deposition of particle-attached radon progeny in the respiratory tract - an experimental study of children and adults in home environments
  • 1999
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • A method to study total deposition of aerosol attached radon progeny in children and adults have been validated and used in home environments. Two persons, one child and one adult are tested simultaneously, thus inhaling from the same aerosol and allowing for a direct comparison. The aim of the study was to increase the knowledge of the lung deposition and thereby the knowledge of the radiation dose from indoor radon. In the study 13 children (ages 4-13 years) and 11 adults were tested in their home environments (five dwellings with elevated radon levels 200 - 600 Bq/m3). Two different aerosols were used: the background aerosol particles when no strong indoor sources were present and the relatively small particles from normal candle burning (activity median diameters (AMD) roughly 200 and 50 nm respectively). An enhanced deposition was found for the children compared to the adults for the smaller particles (mean deposition 38 and 31%), while for the larger background particles no difference was found (31% deposition for both groups). Differences between the deposition of the different short lived radon daughters was found. This was infered to be explained as an ageing effect. In one of the dwellings measurements were performed to estimate hygroscopic growth of the particles upon inhalation. Growth factors between 1 and 4.5 was found. When comparing the results with a stochastic lung deposition model (hygroscopic growth taken into account) reasonable good agreement was found for the smaller particles (experiments 31% and model 26%), while for the larger background particles a roughly doubled deposition was found (experiments 31% and model 15%). A comparison of the deposition when breathing through mouth and nose has also been conducted. This part of the study with adults only was performed in a radon exposure chamber. Relatively large (AMD =500 nm) hydrophobic particles from flickering candle burning (black smoke) were used. Mean depositions of 11 and 17% were found when breathing through mouth and nose respectively. Good agreement was found when comparing with the stochastic model.
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