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Träfflista för sökning "WFRF:(Hellborg R.) "

Sökning: WFRF:(Hellborg R.)

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  • Hellborg, Ragnar, et al. (författare)
  • Accelerators for medicine
  • 2005
  • Ingår i: Electrostatic accelerators. Fundamentals and applications. - 3540239839 ; , s. 24-24
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Laitinen, Mikko, et al. (författare)
  • Mobility determination of lead isotopes in glass for retrospective radon measurements
  • 2008
  • Ingår i: Radiation Protection Dosimetry. - : Oxford University Press (OUP). - 1742-3406 .- 0144-8420. ; 131:3, s. 212-216
  • Tidskriftsartikel (refereegranskat)abstract
    • In retrospective radon measurements, the 22-y half life of Pb-210 is used as an advantage. Pb-210 is often considered to be relatively immobile in glass after alpha recoil implanted by Rn-222 progenies. The diffusion of Pb-210 could, however, lead to uncertain wrong retrospective radon exposure estimations if Pb-210 is mobile and can escape from glass, or lost as a result of cleaning-induced surface modification. This diffusion was studied by a radiotracer technique, where Pb-209 was used as a tracer in a glass matrix for which the elemental composition is known. Using the ion guide isotope separator on-line technique, the Pb-209 atoms were implanted into the glass with an energy of 39 keV. The diffusion profiles and the diffusion coefficients were determined after annealing at 470-620 degrees C and serial sectioning by ion sputtering. In addition, the effect of surface cleaning on diffusion was tested. From the Arrhenius fit, the activation enthalpy (H) was determined, which is equal to 3.2 +/- 0.2 eV, and also the pre-exponential factor D-0, in the order of 20 m(2)s(-1). This result confirms the assumption that over a time period of 50 y Pb-209 (and Pb-210) is effectively immobile in the glass. The boundary condition obtained from the measurements had the characteristic of a sink, implying loss of Pb-209 in the topmost surface at high temperatures.
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  • Liechtenstein, VK, et al. (författare)
  • Advances in targetry with thin diamond-like carbon foils
  • 2002
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 480:1, s. 185-190
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin and stable diamond-like carbon (DLC) foils, which were fabricated at the Kurchatov Institute by sputter deposition, have proved recently to be advantageous for stripping and secondary electron timing of high energy heavy ions in a number of accelerator experiments. This resulted in expanding applications of these DLC foils which necessitated further development efforts directed toward the following applications of DLC targetry: (i) thin stripper foils for lower energy tandem accelerators, (ii) enlarged (up to 66 mm. in diameter) stop foils for improved time-of-flight elastic recoil detection ion beam analysis, and (iii) ultra-thin (about 0.6 mug/cm(2)) DLC foils for some fundamental and applied physics experiments. Along with the fabrication of thin DLC stripper foils for tandem accelerators, much thicker (up to 200 mug/cm(2)) foils for post-stripping of heavy-ion beams in higher energy linacs, are within reach.
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  • Lindén, M., et al. (författare)
  • Channeling studies of As-Grown GaN
  • 2022
  • Ingår i: Physica Status Solidi : Applied Research - Applied Research. - 9783112501177 - 9783112501184 ; , s. 763-766
  • Bokkapitel (refereegranskat)
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