Modulation of the cosmogenic nuclide production expected from the galactovertical motion of the solar system.

A variable-rate cosmogenic production model is proposed which takes account of the changes in Galactic cosmic-ray irradiation conditions arising from the vertical oscillation of the solar system about the Galactic plane. The model incorporates and substantiates several ideas and suggestions previously put forward in the literature. The time distribution of the Be-10 concentration predicted by the model appears to be consistent with the data of the deep-sea sediment core RC 12-65. A comparison of the present model with the conventional constant-production-rate model is carried out, especially with reference to time-integrated concentrations in meteorites.