IODP Expedition 354 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.本数据集涵盖伽马射线衰减（Gamma ray attenuation）数据，采集时采用铯-137（Cs-137）准直源与碘化钠（铊）[sodium iodide (thallium), NaI(Tl)]闪烁探测器。通过水及铝标准样品对采集信号开展校准，以构建体积密度（bulk density）的替代表征量。该测量由搭载于全井眼多参数测井仪（Whole-Round Multisensor Logger, WRMSL）或专用任务多参数测井仪（Special Task Multisensor Logger, STMSL）的传感器完成，单个数据集所采用的测井仪类型将在数据中予以标注。