Some considerations of the Pb-210 constant rate of supply (CRS) dating model

One of the most widely used radionuclides in the study of recent sedimentat ion processes is Pb-210. Its depth profile in sediments is used as input fo r various dating models, which provide chronologies, mass fluxes, and sedim entation rates. In this work we revisited the CRS (constant rate of supply) model, widely used for dating sediments through Pb-210. A more general hyp othesis (periodic flux [PF]) was proposed and, although it confirmed the va lidity of CRS chronology, a detailed analysis of the mass sedimentation for mula pointed our an inconsistency of the cited model. A new mass sedimentat ion formula was proposed and validated with a lake sediment core and four m arine sediment cores.