Half-life: 4,5 billion years
Main emission lines: 65keV, 95keV, 185keV, 750keV, 1001keV
Uranium (without radium impurities) is found in any uranium glass, Red Fiesta glaze, or reagents with uranium compounds. Natural isotope ratio (99.3% U-238, 0.72% U-235). Over time, radium will begin to accumulate, but it would take millions of years for the spectrum to take on the appearance of natural uranium.