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On the depth-dependent production of long-lived spallogenic53Mn in the St. Severin chondrite
Authors:P Englert  W Herr
Institution:Institut für Kernchemie der Universität zu KölnFederal Republic of Germany
Abstract:The contents of spallogenic53Mn and target elements for its production were determined in 80- to 400-mg samples from 13 different locations of the LL6 chondrite St. Severin, along the 34.8-cm drill core AIII. The53Mn content increases from the surface to the center of the stone by ≈30%. The variation with depth is satisfactorily described by several models, presuming that appropriate primary and secondary particle fluxes are chosen. The53Mn saturation activities (53Mn*) are linearly correlated with the spallogenic3He/21Ne and22Ne/21Ne ratios, which suggests the possibility to eliminate uncertainties in the determination of53Mn cosmic ray exposure ages arising from depth effects and terrestrial residence times.
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