天然辐射水平
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Natural radiation level
以上为机器翻译结果，长、整句建议使用 人工翻译 。
结论这种私自开采铀矿已造成了被污染环境生活群体的剂量大大超过天然辐射本底的正常水平，应予以关注。
Conclusion Illegal uranium mining had brought about the fact that the annual effective dose of the inhabitants who lived in contaminated environment was makedly high above the normal level.
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