To examine the influence of the Atlantic Meridional Overturning Circulation (AMOC) on 231Pa/230Th in the North Atlantic from the Last Glacial Maximum (LGM) to the Holocene, we analyzed radioisotopes (230Th, 231Pa, 232Th, 234U, and 238U) in sediment samples from five core sites (IODP U1313, MSM58-13-2, MSM58-28-4, SU90-03 and ODP 983). From these measurements, we calculated 231Pa/230Th ratios and mass fluxes. The isotope analyses were conducted using two instruments: a Thermo Scientific Neptune XT MC-ICP-MS equipped with a retarding potential quadrupole filter at the Institute of Earth Sciences, University of Lausanne and an iCAP TQe ICP-MS at the Institute of Earth Sciences, Heidelberg University. To assess the influence of biogenic opal (bOpal) concentrations on the 231Pa/230Th ratios, we measured bOpal concentrations from the same samples. These measurements followed an automated protocol for dissolved silica analysis using molybdate-blue spectrophotometry, conducted at Heidelberg University. Combined with the radioisotope data, biogenic opal fluxes were calculated.