Data for: A portable internal contamination monitor with dual detectors for screening in a large-scale radiological incident

Fig. 7 presents the spectra of natural background acquired by a portable internal contamination monitor in 5 hours in the internal irradiation physics laboratory. Peaks of K-40 at 1460.8keV and Tl-208 at 2614keV are significant. The 6mm-Lead shield also reduced the count rate caused by the background radia-tion, especially in the low energy region.

Fig.8 demonstrates the gamma spectral of sMBCAM acquired by a portable internal contamination monitor in natural environment. Peaks of artificial nuclides, including Cs-137 at 662keV, Y-88 at 898keV, Co-60 at 1173.2keV and 1332.5keV, are recognized easily.

图7展示了在内部照射物理实验室中，采用便携式内污染监测仪（portable internal contamination monitor）耗时5小时采集的天然本底辐射能谱。其中，钾-40（K-40）在1460.8keV处的特征峰与铊-208（Tl-208）在2614keV处的特征峰十分显著。6mm厚铅屏蔽层同样可降低本底辐射引发的计数率，在低能区域的抑制效果尤为突出。

图8展示了在自然环境中，采用便携式内污染监测仪采集的sMBCAM的γ能谱。从中可轻松识别出多个人工核素的特征峰，包括662keV处的铯-137（Cs-137）、898keV处的钇-88（Y-88），以及1173.2keV与1332.5keV处的钴-60（Co-60）。