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standard device for ground radioactivity survey
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standard device for ground radioactivity survey
Encyclopedia
理学
放射性勘探计量设施
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standard device for ground radioactivity survey
地面放射性测量模型标准装置
由天然K、U、Th矿石(粉)与石英砂、水泥混合制成的含有一定放射性物质的混凝土模块。
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chemical event
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