Why is radium so valuable?

Could you elaborate on the reasons behind radium's immense value? I understand that it is a rare element, but what specific factors contribute to its high worth? Is it its unique radioactive properties that make it so sought-after? Or perhaps its potential applications in medicine and research? Additionally, does its scarcity further drive up its price? As a professional in the field of cryptocurrency and finance, I'm curious to know if there are any parallels between radium's value and the valuation of rare digital assets. Could you draw any comparisons?