Category:Becquerel (unit)
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Media in category "Becquerel (unit)"
The following 2 files are in this category, out of 2 total.
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Radium 226 radiation source 1.jpg 1,712 × 1,368; 453 KB
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Radium 226 radiation source 3.jpg 1,712 × 1,368; 326 KB
