
Gamma ray attenuation (GRA) data were acquired using a Cs-137 collimated source and a sodium iodide (thallium), or NaI(Tl), scintillation detector. The signal was calibrated using water and aluminum standards to provide a proxy for bulk density. This measurement was performed by a sensor mounted on either the Whole-Round Multisensor Logger (WRMSL) or the Special Task Multisensor Logger (STMSL); which track was used for a given data set is indicated in the data.
International Ocean Discovery Program, Gibraltar, hemipelagite, Expedition 401, Site U1609, Messinian Salinity Crisis, Earth Systems Models, IODP, JOIDES Resolution, Site U1611, Site U1610, Land-2-Sea, Gulf of Cadiz, IMMAGE, Mediterranean-Atlantic gateway exchange, Mediterranean Overflow Water, Site U1385
International Ocean Discovery Program, Gibraltar, hemipelagite, Expedition 401, Site U1609, Messinian Salinity Crisis, Earth Systems Models, IODP, JOIDES Resolution, Site U1611, Site U1610, Land-2-Sea, Gulf of Cadiz, IMMAGE, Mediterranean-Atlantic gateway exchange, Mediterranean Overflow Water, Site U1385
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