IODP Expedition 350 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.

本数据集涵盖约0.1至3.0兆电子伏特区间内的自然伽马辐射（Natural gamma radiation, NGR）测量数据。测量过程采用8台定制设计的碘化钠（铊）[NaI(Tl)]探测器，沿岩心测量轴线以20厘米的间隔排布。该自然伽马辐射系统搭载双层屏蔽结构：被动屏蔽（铅）与主动屏蔽（塑料闪烁体及符合电子学系统），用于抑制宇宙射线信号，以开展沉积岩心段的低计数分析，并实现最优信噪比。数据以每秒总计数为基准进行报告，原始光谱数据文件以压缩格式存储，可用于后续分析。