In situ produced 10Be measurements at great depths: Implications for production rates by fast muons

R. Braucher, E. T. Brown, D. L. Bourlès, F. Colin

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Abstract

In situ cosmogenic 10Be values have been used to investigate a Brazilian quartz vein from the surface to a depth of 15 m. At depths greater than 1000 g/cm2, deep enough for neutron-induced reactions to be insignificant, there is only a slight decrease in 10Be concentration with increasing depth. Our results are consistent with deep production of 10Be by a mechanism, presumably induced by fast muons, with an attenuation length of 5300±950 g/cm2 and a contribution of 0.65±0.25% to the total surface production. Results are compared with values from the literature and implications of this re-evaluation are discussed.

Original languageEnglish (US)
Pages (from-to)251-258
Number of pages8
JournalEarth and Planetary Science Letters
Volume211
Issue number3-4
DOIs
StatePublished - Jun 30 2003

Bibliographical note

Funding Information:
We thank Bernard Dupré for U/Th analyses. Fieldwork was facilitated by the logistic support of the Sao Paolo ORSTOM Center and the Federal University of Mato Groso at Cuiaba. This work was supported by INSU-CNRS through the DBT Program Thème 1: ‘Fleuves et érosion’ by INSU-CNRS and ORSTOM through the PEGI Program. Tandétron operation is supported by the CNRS, CEA and IN 2 P 3 . [BOYLE]

Keywords

  • Beryllium
  • Cosmogenic
  • Muons
  • Production rate

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