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Sökning: hsv:(NATURVETENSKAP) hsv:(Fysik) hsv:(Acceleratorfysik och instrumentering) > Naturhistoriska riksmuseet

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1.
  • Kristiansson, Per, et al. (författare)
  • The implementation of a DSSSD in the upgraded boron analysis at LIBAF for applications in geochemistry
  • 2014
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X .- 1872-9584. ; 332, s. 207-211
  • Tidskriftsartikel (refereegranskat)abstract
    • Interest in high spatial resolution boron analyses from a geochemical perspective is related to the recognition of boron as an important tracer of chemical recycling in the Earth, due to the high solubility of boron in aqueous fluids and silicate melts. Although boron is not a nominal component in common silicates they may still contain significant B-concentrations and hence constitute important boron reservoirs in the deeper parts of the Earth. Boron analyses have been performed at the Lund Ion Beam Analytical Facility for almost 20 years. For the analysis the nuclear reaction p+B-11 is used with beam energy just below 700 keV where the reaction has a broad resonance. In this paper we describe an upgrade of the system with a double sided silicon strip detector, which allows for much higher count rates compared to the old annular surface detector based system. A gain close to 20 in the data rate allows for high resolution mapping of boron distributions in crystals. This is illustrated by a number of examples. In addition, the detection limits for boron in geological samples are improved, now around 5 ppmw. In this work we address issues with data quality, especially charge normalization, lifetime correction and subtraction of different background components. (C) 2014 The Authors. Published by Elsevier B.V.
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2.
  • Nilsson, Charlotta, et al. (författare)
  • A nuclear geochemical analysis system for boron quantification using a focused ion beam
  • 2017
  • Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 311:1, s. 355-364
  • Tidskriftsartikel (refereegranskat)abstract
    • Ion beam analysis has for decades been used as a tool for geochemical analysis of trace elements using both X-rays (particle induced X-ray emission) and nuclear reaction analysis. With the geoanalytical setup at the Lund Ion Beam Analysis Facility, the boron content in geological samples with a spatial resolution of 1 µm is determined through nuclear reaction analysis. In the newly upgraded setup, a single detector has been replaced by a double sided silicon strip detector with 2048 segments. After optimization, boron content in geological samples as low as 1 µg g−1 can be measured.
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Pallon, Jan (2)
Ros, Linus (2)
Elfman, Mikael (2)
Kristiansson, Per (2)
Skogby, Henrik (2)
Hålenius, Ulf (2)
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Borysiuk, Maciek (1)
Nilsson, Charlotta (1)
Abdel, N. (1)
Nilsson, E. J. C. (1)
De La Rosa, Nathaly (1)
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