IODP Expedition 368X Natural gamma radiation

Natural gamma radiation (NGR) data in the ~0.1 to 3.0 MeV range were measured using eight custom-designed sodium iodide (thallium) [NaI(Tl)] detectors arranged along the core measurement axis at 20 cm intervals. The NGR system uses layers of passive shielding (lead) and active shielding (plastic scintillators and coincidence electronics) to reduce the cosmic-ray signal for low-count analysis of sediment core sections and to obtain the maximum signal-to-noise ratio. Data are reported on a total counts per second basis and the raw spectral files are available as compressed files for later analysis.能量范围约0.1至3.0 MeV的天然伽马辐射（Natural Gamma Radiation，NGR）数据，采用8台定制设计的碘化钠（铊）[NaI(Tl)]探测器沿岩心测量轴以20厘米间距排布采集。该天然伽马辐射系统搭载多层被动屏蔽（passive shielding，铅）与主动屏蔽（active shielding，塑料闪烁体（plastic scintillators）及符合电子学线路（coincidence electronics）），用于抑制宇宙射线信号，以开展沉积物岩心段的低计数分析，并获取最优信噪比。数据以每秒总计数为单位进行报告，原始能谱文件以压缩格式存储，可供后续分析使用。