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      Correction of non-intrusive drill core physical properties data for variability in recovered sediment volume

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          Physical Properties Handbook: A Guide to the Shipboard Measurement of Physical Properties of Deep-Sea Cores

          P. Blum (1997)
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            Is Open Access

            A New Natural Gamma Radiation Measurement System for Marine Sediment and Rock Analysis

            A new high-efficiency and low-background system for the measurement of natural gamma radioactivity in marine sediment and rock cores retrieved from beneath the seabed was designed, built, and installed on the JOIDES Resolution research vessel. The system includes eight large NaI(Tl) detectors that measure adjacent intervals of the core simultaneously, maximizing counting times and minimizing statistical error for the limited measurement times available during drilling expeditions. Effect to background ratio is maximized with passive lead shielding, including both ordinary and low-activity lead. Large-area plastic scintillator active shielding filters background associated with the high-energy part of cosmic radiation. The new system has at least an order of magnitude higher statistical reliability and significantly enhances data quality compared to other offshore natural gamma radiation (NGR) systems designed to measure geological core samples. Reliable correlations and interpretations of cored intervals are possible at rates of a few counts per second.
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              Eliminating the Rugosity Effect From Compensated Density Logs by Geometrical Response Matching

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                Author and article information

                Journal
                Geophysical Journal International
                Geophys. J. Int.
                Oxford University Press (OUP)
                0956-540X
                1365-246X
                July 01 2015
                July 01 2015
                : 202
                : 2
                : 1317-1323
                Affiliations
                [1 ]the IODP Expedition 341 Scientific Party
                Article
                10.1093/gji/ggv204
                14f67cf3-86fd-4bac-8659-356def43810d
                © 2015
                History

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