IODP Expedition 390 Bulk Density (GRA)

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.本数据集包含伽马射线衰减（Gamma ray attenuation）数据，采集时采用铯-137（Cs-137）准直源与碘化钠（铊）(NaI(Tl))闪烁探测器完成。采集得到的信号通过水与铝标准样品进行校准，以作为体积密度的替代表征参数。该测量由搭载于全周多传感器测井仪（Whole-Round Multisensor Logger, WRMSL）或专用任务多传感器测井仪（Special Task Multisensor Logger, STMSL）的传感器执行，单个数据集所使用的搭载传感器的测井仪类型，将在数据中予以标注。