"Radioactive uranium" refers to a type of uranium that gives off a form of energy called radiation. This energy is harmful and can be dangerous to living organisms. Full definition
Instead, this «gold mine bug» gets energy from radioactive uranium in the depths of the mine. (sciencemag.org)
In addition, new calculations of amounts of radioactive uranium in Jebel Irhoud sediment enabled dating the previously unearthed a child's jaw from the site to between around 350,000 and 220,000 years ago. (sciencenews.org)
You look for rocks of appropriate age, which we can determine by measuring radioactive uranium isotopes and their products in the volcanic rocks interspersed with them, and study their composition. (discovermagazine.com)