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Träfflista för sökning "WFRF:(Pettersson Håkan 1956 ) srt2:(1996-1999)"

Sökning: WFRF:(Pettersson Håkan 1956 ) > (1996-1999)

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  • Carlsson, C.A., et al. (författare)
  • An instrument for measuring ambient dose equivalent, H*(10)
  • 1996
  • Ingår i: Radiation Protection Dosimetry. - 0144-8420 .- 1742-3406. ; 67:1, s. 33-39
  • Tidskriftsartikel (refereegranskat)abstract
    • The design and calibration of a small and simple instrument for measuring the ambient dose equivalent, H*(10), in photon fields is described. Comprising a thermoluminescence LiF dosemeter inside a 20 mm diameter PMMA sphere, it is capable of measuring the ambient dose equivalent with a nearly isotropic response. In the interval 0.1-100 mSv and for the energy range 30 keV to 1.25 MeV the energy response is within -31% and +15% relative to that of 137Cs gamma radiation (662 keV). In practical use, it is therefore sufficient to calibrate the instrument in a 137Cs gamma field using the corresponding conversion coefficient H*(10)/Kair taken from tabulations. The possibility of using the instrument to monitor the ambient dose equivalent for energies above 1.25 MeV is discussed and indicates that the range of applicability can be extended to 4.4 MeV with an energy response within -10% relative to 662 keV.
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  • Pettersson, Håkan, 1956-, et al. (författare)
  • Summary of IAEA-MEL's investigation of Kara Sea radioactivity and radiological assessment
  • 1997
  • Ingår i: Marine Pollution Bulletin. - 0025-326X .- 1879-3363. ; 35:7-12, s. 235-241
  • Tidskriftsartikel (refereegranskat)abstract
    • IAEA-MEL participated in five expeditions to the Kara Sea with the aim of assessing the radiological consequences of dumped radioactive wastes in the Novaya Zemlya Bays and Trough. The programme included sampling, in-situ underwater investigations, laboratory analyses of water, sediment and biota samples, the development of a marine radioactivity database, modelling and radiological assessment, the organization of intercomparison exercises and the evaluation of distribution coefficients. Radiometric investigations have shown that no radiologically significant environmental contamination has occurred. Leakages which have led to locally increased levels of radionuclides in sediment have only been observed in Stepovoy and Abrosimov Bays. Computer modelling results suggest that only radiological effects on local and regional scales may be of importance. The global radiological impact of the disposals in the Arctic Seas will be negligible.
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