Ciro Santilli
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Radium (Ra, 88) | 🗖 nosplit | ↑ parent "Chemical element" | 77

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Discovered by Marie Curie when she noticed that there was some yet unknown more radioactive element in their raw samples, after uranium had already been separated.
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Figure 50. The uranium-238 decay chain is the main source of naturally occurring radium. Source.
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Video 109. "The epic story of radium" by Institut de Radioprotection et de Sûreté Nucléaire - IRSN published on 2013-06-06. Source.
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