IODP Expedition 349 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.

伽马射线衰减（Gamma ray attenuation，GRA）数据采用铯-137（Cs-137）准直源与碘化钠（铊）[NaI(Tl)]闪烁探测器采集获得。采集所得信号以水和铝作为标准物质进行校准，以此作为体积密度的替代表征指标。该测量由搭载于全井眼多传感器测井仪（Whole-Round Multisensor Logger，WRMSL）或专用任务多传感器测井仪（Special Task Multisensor Logger，STMSL）的传感器完成，每个数据集所使用的测井通道将在数据中予以标注。