<sup>10</sup>Be is mainly produced in meteorite by spallation reactions of cosmic ray particles with oxygen, magnesium, silicon or nitrogen in it. The threshold energy is above 500 MeV. The half lifetime o...<sup>10</sup>Be is mainly produced in meteorite by spallation reactions of cosmic ray particles with oxygen, magnesium, silicon or nitrogen in it. The threshold energy is above 500 MeV. The half lifetime of <sup>10</sup>Be in between <sup>26</sup>Al and <sup>53</sup>Mn is 1.6 Ma. Thus the possibility of routine determination of <sup>10</sup>Be in a large number of meteorites constitutes an improvement in studying the exposure conditions of展开更多
We report here a first series of ^(10)Be measurements on loess samples covering the last 750,000 years. The close correlation of the ^(10)Be data with δ^(18)O variations from deep sea cores allows for establishing a ...We report here a first series of ^(10)Be measurements on loess samples covering the last 750,000 years. The close correlation of the ^(10)Be data with δ^(18)O variations from deep sea cores allows for establishing a preliminary time scale. Based on this time scale accumulation rates and ^(10)Be fluxes can be calculated. The accumulation-evolution of loess is also discussed in terms of a simple qualitative model of ^(10)Be.展开更多
文摘<sup>10</sup>Be is mainly produced in meteorite by spallation reactions of cosmic ray particles with oxygen, magnesium, silicon or nitrogen in it. The threshold energy is above 500 MeV. The half lifetime of <sup>10</sup>Be in between <sup>26</sup>Al and <sup>53</sup>Mn is 1.6 Ma. Thus the possibility of routine determination of <sup>10</sup>Be in a large number of meteorites constitutes an improvement in studying the exposure conditions of
基金This work was financially supported by the Swiss National Science Foundation.
文摘We report here a first series of ^(10)Be measurements on loess samples covering the last 750,000 years. The close correlation of the ^(10)Be data with δ^(18)O variations from deep sea cores allows for establishing a preliminary time scale. Based on this time scale accumulation rates and ^(10)Be fluxes can be calculated. The accumulation-evolution of loess is also discussed in terms of a simple qualitative model of ^(10)Be.
