Category:Natural radioactivity
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This category has only the following subcategory.
Media in category "Natural radioactivity"
The following 5 files are in this category, out of 5 total.
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Gama Ray Log.GIF 681 × 111; 16 KB
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Main sources of environmental radioactivity.png 1,357 × 892; 122 KB
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Radioactive Rocks. American museum of natural history. New York.jpg 1,200 × 1,600; 342 KB
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Radioactivité de la bauxite Hongrie RadioactivityMagyar.jpg 1,010 × 666; 125 KB
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亞佛加厥數-5.png 842 × 633; 34 KB