The world’s entire manufactured supply of radium was produced between 1898-1960s, we only have really been making radium on a commercial scale for roughly 50 years. In the U.S alone (even before production fully ramped up) about 70 grams of radium was sold just for radioluminescent paint used in consumer items between 1913-1920. Public demand for radium was so crazy that by the 1930s, doctors were complaining there wasn’t enough left over for medical and scientific work. Only around a few thousand grams were ever produced worldwide across that period. Every bit of it still exists in some form today (thanks to its 1,600 year half-life like you mentioned) but we only know the exact location of roughly 2–5% of it. The rest is scattered everywhere. Over 40% of global radium output was sold directly to the public in luminous compounds for quack medicines, pocket watches, alarm clocks, paint kits, light switches, pull chains and all other sorts of novelty items like you see me posting. Another 20–30% went to the military for luminous paint applications. The British Navy was one of the biggest users, their standard allowed up to 250 µCi of radium per gram of paint because I guess they REALLY wanted to see in the dark. Anyways, that makes it the ultimate treasure hunt for me and I’ll gladly contribute some of my space in life for helping preserve some of it. haha, radium go brrrrrrr ☢️ (I just bought this watch, btw)