Beryllium-10 is the longest-lived of the seven known unstable isotopes of Be; it results mostly from the interaction of cosmic radiation, primarily neutrons, with a variety of target atoms by spallation, the splitting of nuclei (Lal 1988). It can also be produced at very low levels by radio-disintegration of U and Th (Sharma and Middleton 1989). Although all radioactive Be isotopes are produced in the atmosphere via cosmic-ray reactions (Arnold 1956; Lal and Peters 1967; Morris et al., Chapter 5, this volume), in this paper, we are most interested in 10Be produced...

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