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  • Other Sources  (2)
  • Elsevier  (2)
  • Wiley
  • Springer Science + Business Media
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  • 1
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    Measurement of carrier-free 10Be samples with AMS: the method and its potential (2004)
    Elsevier
    In:  Nuclear Instruments & Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 223-224 . pp. 247-252.
    Details
    Publication Date: 2017-02-13
    Description: A method for direct measurement of the natural 10Be/9Be ratio in a sample by AMS is presented. Samples of 100 ng of Be with 10Be concentrations orders of magnitude higher than in conventional 10Be AMS samples were produced without the addition of 9Be carrier and analysed using the accelerator secondary ion mass spectrometry (Accelerator SIMS) source of the PSI/ETH AMS facility. Special mounting techniques and the analysis procedure using a focussed Cs+ beam of up to 600 nA and beam spot diameter of 100 μm are described. The results of measurements on two test samples from Pacific ferromanganese crust D11–1 are presented and compared with similar measurements by conventional secondary ion mass spectrometry (SIMS). Background measurements at a level of ∼5 × 10−11 indicate that ratios of a few times 10−10 could be measured to a precision of ∼10%. PACS 29.17.+w; 29.30.−h; 82.80.Ms; 89.60.+x
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    A 200 kyr record of cosmogenic radionuclide production rate and geomagnetic field intensity from 10Be in globally stacked deep-sea sediments (1997)
    Elsevier
    In:  Earth and Planetary Science Letters, 149 . pp. 121-129.
    Details
    Publication Date: 2016-11-14
    Description: The reconstruction of geomagnetic field intensity variations during the last 200 kyr from paleomagnetic data is at present the subject of numerous studies and major debate. There is currently no generally accepted record. Here we present a global stacked record of (230Thex-normalized)10Be deposition in marine sediments representing relative variations in 10Be production rate which are translated into field intensity variations. The record shows major periods during which the field intensity was between 10% and 40% of the present day value; namely 30–42, 60–75, 85–110 and 180–192 kyr B.P. Our results are compared to independently derived paleomagnetic studies and Th/U calibrations of 14C dates on corals. During most of the observed period the geomagnetic field intensity was weaker than today, resulting in an overall 30% reduced value for the last 200 kyr.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
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